I don't think all homosexual conversations are propelled by sexual content. In reality, we are more apt to discuss our political conditions, educational aspirations, our partners successes, our personal career goals, our children's latest achievements, how our pets are doing, a great recipe we found, an awesome sale, and on occasion a tid-bit surrounding a special intimate moment that has warmed our hearts, just like any other well adjusted, socially healthy and appropriate human being would. So, for you to claim that "Homosexuals it seems talk about sex all the time" would be your perception, and not the actuality of the community at large. More often then not, those few extreme folks (from ANY social grouping) will stand out seemingly representing the moral and traditional standards for that group. This is how the extreme perceptions of Dumb Red Necks, Black Gangsters, White Power Supremest, Black Power Supremest, Hateful Evangelical Christians, Cheap Hasidic Jews, Terroristic Muslims, and just about any other group that has a sub-grouping more willing to be expressive and fearless for their beliefs in an outward manner.
Honestly, I have heard many conversations of businessmen in the office break area who talk graphically about their sexual conquests with women more often than I have ever heard a grouping of LGBTQ folks discuss the topic of their sexual exploits. Well, unless I am at a White Party in Spring... ;)