First off, I just want to say that one of my closest friends is gay, so I'm in no way using this MyTake to trash homosexuality. The reason I think it would be interesting to talk about the nature vs. nurture debate is that 1) has been struggling with his sexuality (and still is), and 2) I've come across material that deals with this argument (which I find interesting).
I do believe that people can naturally have homosexual tendencies. In fact, I think nearly all of us have moments where we're at least curious about the same sex. A lot of young teens come to online forums such as GAG asking if other users think they're gay, lesbian, or bi. Being a teen is weird, confusing, and difficult. Your hormones are all out of order and you're beginning to change until a sexual being. With that said, these hormones can cause urges, arguably towards either gender. Additionally, young teens are often naturally curious about same sex friends' bodies because they're going through a period of change. I've seen a lot of questions from people in this age group asking if their bodies are normal in one way or another. When these teens grow closer to adulthood, they become more drawn to one gender or another. This is the nature side of the debate.
The nurture side is more difficult to prove, but I have some ideas on it. It seems that there is a correlation between people who identify as homosexual (or bi) and gender/sexual surroundings in their lives. Most homosexuals I meet either experienced sexual trauma at a young age or grew up in a home with divorced or separated parents. For instance, my friend's dad left when he was young. He never had a good relationship with either of his parents. However he was raised by his mom and is now struggling with sexuality.
In my psychology class, we talked about how when children are born, they're drawn to their mothers. As they grow older, boys tend to connect more with their dad (providing the father is actively part of their lives) while girls identify more closely with their mom (again, providing the mother is a part of their lives). When one parent is absent, the children have no choice but to connect with the one parent they have. Therefore guys can become more feminine while girls can become more masculine. This accounts for the confusion a lot of homosexuals have about their sexuality. They more closely identify with the opposite gender yet still feel some sort of tendency to identify more closely with their own gender. They crave closeness from the same gender because they've been deprived of it. This can also work the other way around. My parents aren't together and have had problems since I can remember. I live with my mom and I'm not close with any male relatives so I'm finding myself curious about relationships with guys and crave a close bond with a guy.
So I think it's a bit of both nature and nurture, but I think I'm leaning more towards the nurture side. Again, i'm not against homosexuals (after all I have a gay friend who I love to death!). I just find this topic interesting, especially after learning about it. What do you think? Feel free to comment, but be nice to one another! This is a touchy subject for some people.