In the late 70's I tended to have a type and that type was a competitive bodybuilder. Things are what you make of them. Everything is a trade off and this is no exception. Just as a point of note, I am a top, and a really muscular butt is a sheer joy to plow. The gym and the diet are things that by today's standards one can life with. When I was dating in those years we simply incorporated his goals into our time together. I did not, in the end, do my life-commitment to a bodybuilder, but it was not based on bodybuilding or body type. My commitment was based on who or whom I was really in love with. Back in the later years of the 70's as I have said I had a great deal of sexual experience. I tried different body types, different ethnic backgrounds, and because life was a smorgasbord of men, I did OK.
I think that even most gay bodybuilders would say if they are interested in a relationship is that the whole thing is the mutual goals of both individuals.
The sex..... Well, a man in good shape can do some things that those who are not cannot do especially with regards to endurance. Yet at the same time those of you who are bodybuilders can relate to a couple of sexual positions that are more difficult simply because of your size.
A really incredible body could open a door with me, but it took a brain and some reciprocation to sustain things. If one has never had fun with a bodybuilder I would say "Don't knock it till you've tried it." I enjoyed it when I had the opportunity.