I'd also happily bet that being homosexual is much more like being into BDSM or the various fetishisms than being in possession of the mechanism of attraction a member of the opposite sex typically has for one's own sex.

To make sure I'm understanding you correctly, do these predictions follow from your idea?

• Male homosexuals will, like male heterosexuals, generally be strongly motivated by the appearance of their partner and will seek sex with many partners.
• Female homosexuals will, like female heterosexuals, generally be strongly motivated by the personality and stability of their partner.

Those seem generally accurate. My introspection (as a cis-gendered male homosexual) suggests that I'm interested in male mating patterns.

Equally, among the gay community you find all sorts of identifications

I'm one of the 'straight men who have sex with men' but I know people who are essentially straight women happy with their male bodies. That suggests to me that MtF transsexuals are women who are unhappy with their male bodies. Is your claim that the primary difference between a MtF an a female-gendered gay is the body dysphoria, which is similar to Otherkin?