jocks: adult or mainstream?

Hi, I am going to start work in a site that deals with fitness and hypnosis (might just call it trance due to issues hypno seems to arise). Though it'll be some time before I get it up as I am just starting on the new files, I was planning on selling other items through affiliates that would relate.

One such product I've seen are jocks - underwear / jock straps. My question is, if I operate this site using sites such as PayPal, would such affiliates be allowed or considered adult? I've read some stories about how strict PayPal can be and while I myself would not consider this adult, I wasn't sure. Any thoughts on this?

Thanks. And also appreciate any tips on high converting sites that'd also relate to this site