Tantric is the adjective most people type when searching; on this site a tantric massage and a tantra massage are the same booking, at the same price.
Grammatically, tantra is the noun and tantric the adjective, and in English the two have drifted into use side by side. Search data shows people reaching for either, sometimes in the same week. Tantric massage tends to be the phrase of someone looking for the experience; tantra massage is more often the phrase of someone who has already read a little. The house treats both as one request.
Because the adjective is loose, it appears on many Amsterdam listings that offer little of what the technique implies. A reader comparing services can look for three things rather than the word itself. Does the listing speak of pace and breath, or only of atmosphere? Does it steer toward ninety minutes or more, or sell the shortest rung first? And does it describe the session plainly, without promising spiritual results? A tantric booking with this house answers those three the same way the tantra entry does.
The adjective is sometimes stretched to cover anything slow and adult. That usage blurs a useful difference. Sensual names a register of touch and mood; tantric names a structure built around tempo and breathing. Lingam and yoni are narrower still, naming the tantric session as offered to a man or to a woman. The sensual versus tantra entry sets the first pair side by side.
A client may write tantric, tantra or simply slow in the thread; the office will understand. The technique is priced on the same ladder as every other, where an hour costs EUR 180 and ninety minutes EUR 270, with the full list on the price page. The tantric massage guide covers the booking in Amsterdam at greater length.