That's gross, dude. They call can be used for clits. The longer one is to be inserted, definitely. The smaller ones can be inserted, as well.
At 100% usage, one of the small ones goes in the anus, the big one in the vagina, and the last small one on the clit.
I can see how they could also be used on men, but I don't think it was primarily designed for men.
I don't think this is a PG-13 subject.
Mods, I apologize in advance if my post is not appropriate. I'm just explaining it.