So far, I'm hearing a lot about the physical reasons a man would be attracted to a lesbian. Yeah, she's got the biological cunterparts a man needs for his man parts to fulfill.
What about pondering a bit deeper than skin?
What about the personality aspects of a lesbian in comparison to a heterosexual female? When I think of lesbian or gay, I think of someone who MAY be more comfortable with their masculine, feminine and sexual side. I've had very strong attractions to certain gay men, finding them to be quite confident, openly expressive, in touch with their hip gyrations while dancing, (ohhhhhhhm nom nom XD), friendly. I've seen this in certain lesbians too, active strength of character for example. Some heterosexual males and females are quite insecure with their sexual identity among many other aspects of themselves and others. Some homosexuals too.
I want to address others beyond strict homo or hetero sexual though. Generally someone who is comfortable with who they are, physically, mentally, emotionally, and sexually, among other aspects, is quite attractive methinks. Perhaps many lesbians display this, and thus they glow with something quite desirable that not only one wants from them, but wants within themselves (confidence, zest for life, etc)
add more, anyone, I kinda ranted this together like a mosaic of words and ideas.