Hey Marc, nice to see a familiar name
I'm with Clickbuster - gay porn sells much better. Of course, you need to find your niche and all that. My best conversions are with gay sponsors, and I'm not sure how my personal preference for men plays into that (hey, maybe it does, just not sure...)
As for all you specific questions - there is no one answer. Hetero sex is just as varied as gay sex and different people have different tastes.
You know, so many straight webmasters treat gay porn as a "niche" and not as the varied market that it is with so many niches. I would say, try not to look at straight porn as a niche - it's much more complex than that.