Re "this only works for straight males" - the research that I have read indicates that females are aroused by a much broader range of visual images (even images of monkeys), whereas males are focused on the images which are in their sexual preference realm.
[I believe I read this in "Sex Before Dawn", a book I quite enjoyed.]
So, anyway, it might work for females too.
I was going to try it out, but after the first picture, I realized I should probably wait until I get home. :)
the research that I have read indicates that females are aroused by a much broader range of visual images (even images of monkeys)
Physically aroused, not psychologically. There is no way to say this delicately but the women in the study would start lubricating when witnessing anything sexual in nature but they weren't on the verge of orgasm or anything. They could still find the imagery unpleasant and in fact didn't actually feel aroused while witnessing the monkey business. The researchers hypothesized that this had to do with protecting the lady parts even in a situation of unwanted sex.
I think I would still reword "this will only work for straight males" to "this will only work for those that are aroused by men doing women" (or whatever the subject matter is, in this case). The audience is probably bigger than originally presumed.
So, anyway, it might work for females too.
I was going to try it out, but after the first picture, I realized I should probably wait until I get home. :)