Karsai / prostate massage (Karsai Nei Tsang) is the niche, health-leaning corner — internal/groin and prostate work, more therapeutic-tantric than the standard erotic menu. It's a small scene in Pattaya (far fewer venues than Bangkok), found at select health and tantric-massage spas rather than the bar sois.
Because it's specialist, prices sit higher than a basic massage — typically 1,500~3,000฿ for a proper session, with full service, where offered, negotiated separately. Look for places that actually know the technique; this is one to choose on reviews, not on a walk-by.
By appointment or walk-in at the spas that offer it, mostly daytime into evening. The 1 venues below are live-ranked by 7-day visitor traffic and recent reviews. Updated daily.