ET, we'll just have to agree to disagree about the necessity of "homosexual marriage".
As to empiracal studies, there is one major problem with statistics. They're too easily skewed and often only reflect a small subset of opinion and behavior, while being extrapolated to reflect a much larger one. Further, given that you don't really know if the participants are being truthful, you have no way to know which parts of a study would have any validity. Everything is couched in assumptions. But, no, I didn't make the statement up. It is based on the claims of prolific sexual conduct on the part of many young gay males (perhaps lesbians are more monogamous). But as I've stated above, it's possible they are lying and that there is no real way to know. So, in the interest of fairness, I'll disclaim that statement.