- Q1 I'm not sure which course is right for me.
- Q2 What should I wear during a Karsai Nei Tsang session?
- Q3 I feel embarrassed if I get an erection during Karsai Nei Tsang.
- Q4 I am worried that I might ejaculate during the session because I tend to have premature ejaculation.
- Q5 Do you offer any "refresh" (ejaculation) service at the end of the session?
Karsai Nei Tsang / Jap Karsai（Genital Therapy）
About Karsai Nei Tsang （Men’s Work）
Karsai Nei Tsang is a hands-on bodywork method developed for men.
It combines ancient Chinese abdominal detox techniques (Chi Nei Tsang), Taoist energy theory and Qigong, along with traditional testicular massage methods (Jap Kasai) that have been practiced in parts of Thailand.
At our salon, we use the term “Jap Kasai” purely for convenience when referring specifically to work on the genital region.
The session gently stimulates key areas such as the lower back (near the kidneys), glutes, abdomen, and groin — including lymph nodes, blood vessels, and energy lines.
This approach helps activate internal organ function, improve blood circulation, and support male reproductive health.
Rather than focusing only on the testicles, the session promotes whole-body energy circulation to help maintain prostate health and potentially prevent issues such as erectile dysfunction, reduced libido, or low sperm quality.
Since we began offering this treatment in December 2010, over 4,000 men — including those struggling with ED or stamina concerns — have chosen this therapy.
At Krathoorm, we honor the essence of traditional Thai techniques while blending in both Eastern and Western bodywork approaches.
We have refined these elements into our original method called “Men’s Work.”
Many clients have reported feeling lighter around the belly or sensing renewed vitality after the session.
It is especially well-received by men dealing with daily fatigue or concerns related to aging and masculinity.
Genuine Techniques
Over 15 years of experience — grounded in formal training in Chiang Mai, and refined through real customer feedback.
In 2010, Krathoorm became the first Japanese practitioner personally trained by Ms. Woo, former assistant manager of Tao Garden.
That same year, we began offering this therapy to customers in Osaka, Japan.
In 2017, I returned to Chiang Mai, Thailand to complete an advanced teacher training course.
In 2018, through a project we called the “Re-Design Project,” we began integrating various Eastern and Western techniques into the session.
Since then, we have continued to refine and evolve our original method.
In the spring of 2019, our original “Men’s Work” program was fully redefined and relaunched — a method we are proud to offer as uniquely developed by Krathoorm.
Since then, it has continued to evolve through practice and refinement.
We especially recommend the 180-minute Men’s Work (Men’s Sweet), which combines this method with highly compatible aroma bodywork.
Whether it’s your first time or a return visit, we invite you to experience Krathoorm’s original Men’s Work — a time to relax, recharge, and reconnect with your masculine energy.
History of Certificates – Genital Massage (Karsai Nei Tsang)
November 2010
Thai genital massage
January 2017
Teacher Training Genital Therapeutic
(Karsai Nei Tsang) Massage (60Hours)
※The certificate dated January 2017 is displayed at the Krathoorm salon.
Session Flow: Karsai Nei Tsang
STEP 1 Around the Buttocks and Back
Before the session begins, you will be guided to take a shower.
The session starts with a light full-body warm-up while lying face down on the bed.
Then, we apply specialized techniques focused on the back and buttock area.
Note: This back and glute-focused work is not included in the 60-minute course.
STEP 2 Abdominal Work
You will lie on your back, and we’ll begin with a gentle release of tension throughout the body once again.
The entire abdomen is then carefully relaxed, followed by focused work on various key points in the abdominal area.
Note: This step is not included in the 60-minute course.
Some techniques may also be omitted in the 90-minute and “Light” versions of the session.
STEP 3 Genital Area
Changing positions, we continue with focused work around the lower abdomen and genital area, targeting various key points.
Prostate-focused techniques can also be included upon request.
Of course, you are welcome to take another shower after the session.
Depending on the course you choose, this step may be integrated with general bodywork techniques.
Men’s work Menu
If you pay in Japanese yen (cash), you will receive 1,000 eCredit (equivalent to 1,000 JPY), which can be used immediately.
60 min – 13,000 JPY
Jap Kasai
Trial menu with only a few selected techniques.
90 min – 16,000 JPY
Karsai Nei Tsang Lite
120 min – 19,000 JPY
Karsai Nei Tsang
Standard genital-focused course.
📌 No.2 Recommendation
150 min – 22,000 JPY
Signature Sweet Lite
Aroma Bodywork + Karsai Nei Tsang Lite
180 min – 25,000 JPY
Signature Sweet
Aroma Bodywork + Full Karsai Nei Tsang
🌟 No.1 Recommendation
210 min – 28,000 JPY
Signature Happy Lite
Thai & Aroma Bodywork + Karsai Nei Tsang Lite
240 min – 31,000 JPY
Signature Happy
Thai & Aroma Bodywork + Full Karsai Nei Tsang
Bodywork is not included in courses shorter than 150 minutes.
Please choose a course of 150 minutes or longer to include bodywork techniques.
If you would like to experience this session, you are welcome to make a reservation anytime via our booking page.
Menu Details
The menu above is designed to be easy to choose from, even for first-time visitors, and reflects our recommended course combinations.
Depending on your physical condition and preferences, we can adjust certain techniques or treatment styles — such as using Thai-style bodywork instead of oil massage.
Please refer to the detailed descriptions below for more information.
Karsai Nei Tsang (Genital) / Jap Karsai
A professionally certified therapy focused on supporting male reproductive health, based on authentic training received in Thailand.
This session involves careful, hands-on work not only on the testicles, but also on the back, abdomen, and the area surrounding the genitals.
The aim is to help improve reproductive and urinary system function.
Note: The 120-minute session is the standard format. Some techniques are not included in the 60- or 90-minute versions.
🔹 Standard Men’s Work Courses
120 min – Full Karsai Nei Tsang
60 min – Jap Kasai (introductory genital-focused session)
90 min – Karsai Nei Tsang Lite
Men’s Sweet (Signature)
A combined session of:
- Aroma Bodywork
- Karsai Nei Tsang
This course is designed to promote both full-body relaxation and male reproductive vitality.
🔹 Standard Options
Men’s Work 180 min
Standard course combining full-body Aroma bodywork and Karsai Nei Tsang for both relaxation and male vitality.
Men’s Work 150 min (Light)
Shorter version focusing on key techniques from the standard course.
Men’s Bitter (signature)
A customized session combining
・Thai bodywork
・Karsai Nei Tsang
—ideal for deep physical relief and enhanced male vitality through firmer pressure and stretching techniques.
Men’s Happy (Signature)
A signature session that blends three of our most requested techniques:
• Genuine Thai Bodywork
• Aroma Bodywork
• Karsai Nei Tsang (male vitality work)
This all-in-one course offers a dynamic and gentle release for both body and mind—combining firm pressure and relaxing oil techniques with inner balance work unique to this style.
We also take pride in using premium-grade aroma oils and body soaps.
After your session, enjoy a complimentary premium drink as a refreshing finish.
🔹 Standard Options
Men’s Work 240 min
Standard course combining full-body Thai & Aroma bodywork and Karsai Nei Tsang for both relaxation and male vitality.
Men’s Work 210 min (Light)
Shorter version focusing on key Karsai Nei Tsang techniques from the standard course.
FAQ
Q1 I’m not sure which course is right for me.
For first-time visitors, we recommend either the standard 120-minute Karsai Nei Tsang session, or the 180-minute course that combines bodywork and Karsai Nei Tsang.
If you’re unsure, feel free to contact us in advance. We’ll be happy to help you choose the best course together with the therapist.
Please note that consultations made after your arrival may reduce your actual session time due to the need for preparation and schedule adjustments. Whenever possible, we recommend reaching out to us beforehand.
Q2 What should I wear during a Karsai Nei Tsang session?
Karsai Nei Tsang includes care for the lower abdomen, groin area, abdomen, and buttocks to help improve circulation and release tension. Because of this, you will be fully undressed during the session. Rest assured that areas not being treated are always covered with a cloth or towel, and the therapist will only expose the area being worked on at that moment.
Our salon is male-only and treatments are provided by a male therapist for male clients only, respecting your privacy and offering no sexual services.
Q3 I feel embarrassed if I get an erection during Karsai Nei Tsang.
Karsai Nei Tsang techniques are designed to promote better blood circulation, so getting an erection during the session is a natural physical response and can be seen as a sign of healthy function. The therapist will not be concerned at all, so please feel at ease.
Q4 I am worried that I might ejaculate during the session because I tend to have premature ejaculation.
Karsai Nei Tsang techniques do not involve any actions that intentionally stimulate ejaculation. However, due to improved blood flow, some clients may experience involuntary ejaculation during the session. If this happens, please rest assured that it is not a problem and there is no need to feel embarrassed.
Please note that our salon does not provide any sexual services. Any attempt to force explicit sexual acts or any inappropriate behavior will result in the immediate termination of the session and you will be asked to leave. In such cases, refunds will not be provided.
Q5 Do you offer any “refresh” (ejaculation) service at the end of the session?
We do not offer any kind of sexual services.
Our sessions aim to promote healthy circulation and energy flow, and are not intended to fulfill sexual desires.
For this reason, we kindly ask that you refrain from visiting with such expectations.
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