I'll go ahead and throw my ideas about "the homosexuality" into the discussion. I think that it's good that we use our personal experience to test whether someone's idea of homosexuality (or anything, really) actually works.
But if we define homosexuality soley by our own experience, we can miss the bigger picture. Homosexuality is part of something much bigger and really a universal part of the experience of being human:
sexual orientation.
Sexual orientation is what pulls us to form a sexual and romantic bond with other people. It's a part of everyone's personality. The majority of people are drawn to physical intimacy and affection for the opposite sex (heterosexuality). Some are not and form these feelings for the same sex (homosexuality).
Sexual orientation is involuntary. Whether it is genetic or learned later doesn't affect the fact that these are responses that come from deep within ourselves - they are not choices. You can choose to have sex with someone, and you can choose to pursue someone romantically; you can choose to ignore your feelings and attractions completely. But even someone who has never had sex in their life, experiences their sexual orientation (if they are past puberty).
But there is another way that the term "homosexual" is used (and this often confuses discussions). That is the idea of
sexual identity - which is how one identifies oneself. This is tied up in the ideas of who we think we are and what community we claim to be a part of. You can experience homosexual attractions, and even have homosexual experiences, but still identify yourself as part of the heterosexual mainstream. This is important to understand especially when looking at figures in the past. For example, Alexander the Great may have had a romantic and sexual relationship with another man. But would he identify himself as homosexual? No - he would not have understood the concept.
I noticed that my doctor navigated neatly around this identity issue when I went in for a checkup, and as part of the exam he asked me "Do you have sex with men? Do you have sex with women?" He could have asked "Are you straight or gay?", but he knew that asking that question would get bogged down in identity and possibly not give him the data to know which direction to go in discussing my sexual health.
The two key things here are:
- Everyone experiences sexual orientation, of which homosexuality is just a part.
- Orientation is involuntary, but sexual identity is a conclusion we draw about ourselves based on our experience and other social factors.