Fertility massages (or massages that stimulate the reproductive organs) cannot be considered separately from abdominal massages.
The fact is that the reproductive organs and tissues, such as the uterus, ovaries, fallopian tubes, cervix, prostate, and vaginal canal are located inside the abdominal and pelvic area. Sure, the penis and testicles are exceptions, but those also have connections inside the body, notably with the urinary tract system and prostate.
It means that an Abdominal Massage usually also addresses (part of) the genital i.e. reproductive organs. An Abdominal Massage is in reality an Abdominal Internal Organs Massage, specifically focusing on those organs that are located in the abdominal and pelvic cavity.
A Fertility Massage can be considered a specialization of Abdominal Massage. The main difference with a general abdominal treatment is that the attention of a Fertility Massage is directed at the reproductive system and organs. Nevertheless, a Fertility Massage treatment is typically preceded by an Abdominal Massage to prepare the body of the receiver for more specialized work on the reproductive organs.
When we look at it the other way around, an Abdominal Massage is not necessarily a Fertility Massage. The massage can be directed at other health issues, such as problems with the intestines, liver, stomach, gallbladder, the diaphragm, and such, or releasing knots, tangles, contractions, scar tissue and adhesions in this region, maybe even rather with an aim to release physical or emotional trauma.
Chi Nei Tsang Abdominal Massage, for instance, is an all-purpose Abdominal Massage. Karsai Nei Tsang Massage (a specialization of Chi Nei Tsang) is specifically designed to work on the genital organs. Other examples are Mayan Abdominal Massage and Arvigo Therapy, which are basically general abdominal massages, but have been positioned as “fertility massages.” But then again, Malay Urut Batin Manhood Massage and Thai Jabkasai Testicles Massage, to name two other examples, are specialized genital massages.
In any case, “Fertility Massage” is not a specific massage modality. It’s an umbrella term for a broad range of (specializations) of different kinds of traditional abdominal massages. Nevertheless, it has become fashionable today to “take a Fertility Massage” — nothing wrong with that — but it’s good to know what it actually stands for.