Idk how else he could do that, but as for striped, idk if that's the advice she's looking for.

I think all 3 of them are trying to stick to abstinence. He may have personal reasons why he wants to avoid it. Plus she refers to the fact that they are his girlfriends. Some people are set on waiting until marriage.
Also, I quote from her first post
These three are asking for information on how to reduce his hormones other than to have a sex life or by masturbating.

I hope you find the answers you need =)