Straight Niches That Convert Well?

So Ryan has been bugging me about getting a straight affiliate program up and running and as such, im looking for information on straight niches that are selling reasonably well right now, i know that conversions on the straight niche overall are a lot lower than in the gay market but, out of the various straight niches, do any of you know the ones that are currently converting better than others?

For example, im thinking that 'teen' probably converts a lot less than 'mature' does and likewise im sure 'tranny' sites are selling a lot better than 'lesbian' sites.

Any info or advice you folks have on this type of thing that you may want to share?

Regards,

Lee