Well, since I don't know what kind of porn you have, (mags or videos), it's hard to be specific. Just ask him the next time he's over if he'd like to watch a sex tape (if you have vids) as a warm up for sex. Or suggest you read some erotic stories or look at some sexy pics as part of your foreplay. Let him know you have some quite readily available and I really doubt he'll complain. Just don't get in the habit of using it all the time, or it could end up with your sex life "revolving" around it.