14 Answers

If you're ready to become a grandparent, then it shouldn't be a problem.

Ducky

And it's quite all right to tell your teenager NO! He may actually be told that again sometime, during his life.

Ducky

:)

He'a 19. If he lives home with you and you are uncomfortable about it, tell him to get his own place. 

As long as not with my 16 yr. old daughter~!  (Mine is 16 +  but you get the idea)

What's the difference in laying down watching TV or sitting up??  as long as they aren't 'petting' having sex, kissing, necking, as long as there's no touching other than holding hands and there's no blanket over them.  They are s'posed to be watching TV, that's all.  I see nothing wrong with it. 

Lay down with them-- Make them uncomfortable if it bothers you so much.

Colleen

LOL, I like the last idea!

It is obviously something that makes you uncomfortable, because you have brought it to a worldwide website for advice. 
Personally, I don't like it, either.  Tell him, privately, that you are uncomfortable with it. If he is respectful, you did something right.
OTHERWISE, watch TV with them, and tell them to move their heads (NOT FEET), so you can sit on the couch, too.  

It's not ok for him to lay down with your girlfriend.

Your house - Your rules.

He's of age, but it's your house, so you call the shots. It would be ok if he were in his own apartment or house. It's up to you, Dad.

Ask the girlfriend's parents how they feel about it.

Mr. Angel Make them lay on the floor then accidentally step on them every few moments. Turn programs on only you like. Invite all your old buddies over to watch TV

I think it's a matter of personal opinion based on what you feel is appropriate in your family home.

You would not need a t/v for entertainment then,

Yes but only in the family room with you and the rest of the household and rent some  movies watch them or  watch TV

as long as they keep their underwear on