Is Being Gay a Choice?
It is conceivable that certain people are more attracted to the same-sex than the opposite-sex, since each gender has a wide range of masculinity and femininity. However, this is just an observation. The scientific community seems to waffle on this topic in both directions, so there is clearly no direct link.
The problem with this question is that it is not asked in the right context. Relationships are not only about sex, but about gender, which is often overlooked (assuming that being gay is more than just about sex) And, there can be no question, scientifically speaking, that there are genes that determine gender; Female's are XX and Male's are XY. This makes it unlikely that any future research into a gay gene would find stronger evidence than that.
Also, it is interesting that in many gay relationships it is common for someone to take on the female role and the other person to take on male role. This is another indicator that there is indeed a biological predisposition to gender attraction, and that perhaps being gay is mostly about sexual attraction, which would again point strongly to it being a choice. A person's genetic makeup will no doubt factor in on the choice of being gay, but it would be equivalent for any any other choice we make.