No problem as long as they know the risks as Studfinder pointed out and we know that if things end up on the net they are there forever. But never if under age.
I love it, I thought it was going to be hard but if you just let your imagination go and you have someone whose timing and words work for you it can be a lot of fun!
So what happens when the relationship sours or if someone else discovers his stash with you in it? It's risky stuff.
It's risky business, cause you don't know where it's going to go from there....