The way I see it, there's what I like, what Achilles et. al. are good at drawing, and what is popular.
What I like is M/F and F/M, spiced up with a good bit of device-tickling.
What I think Achilles et. al. would be good at is M/M (obviously) and F/M (especially if the Females are busty amazon types). Possibly some device tickling, too. But not so good at M/F & F/F. (OTOH, Achilles says that he gets turned on by sexy M / helpless F tickling, so I Could Be Wrong about the M/F.)
What seems to be popular is M/F and especially F/F. As I grumbled over in the story forum/writer's workshop, F/F seems to be really really popular. But this is complicated by the way that different people like (and dislike) different things.
If "Achilles Heel - Amazons" (or whatever he decides to call it) turns out to be well-stocked & frequently updated with F/M and maybe some M/F stuff, skipping the F/F, I think that would be great. I might even be able to contribute a few things myself (e.g. some "centaur tickling" stories). And I'll hope that the site/section will be popular enough to keep going.