My thought is be very careful and clear about setting up boundaries and expectations and be prepared if things don't turn out the way you plan. What happens between consenting adults is really no ones business. Sometimes though, we forget that sex is more than a physical act...emotions and vulnerability come into play here.
That's my 2 cents anyways...

And to the underage on this forum - if that is something you are also considering, please protect yourself - both physically and emotionally