My 15 yr old son's girl friend is living in his house until end of this school year

I have a question and it deals with  my 15 year son  and his 15 year girl friend.  My son has two typical divorce family homes he lives in. the problem is his girl friend lived out of state.  His mother and the girl friend's mother has decided that the daughter(girl friend) will live in the same house (with my ex wife and 13 year old daughter) It wasnt my idea to do all of this. now since the girl friend is living in their house  she also come to my house and sleeps over every other weekend. The girl friend shares a bedroom with my 13 year old daughter. My son's room is across the hall from his girl friend.  soooooooooo here is my question  I dont think its a good idea for them to hang out in each others bedroom and laying on the bed together (with blankets covering them sometimes) any advise on how to explain to them that this is not ok and they need to spend their times somewhere besides their bedrooms.  HELP!

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[dlr2007]

I would just explain to your son and his gf that in your house there are different rules, and you don't let kids of opposite sex spend time unsupervised together. Of course they will argue that they do it at your ex's house (and most likely they have sex regularly anyway) but you can just stand firm. I would be very concerned about them using proper birth control at this point too. Just because you don't allow them to have sex in your house doesn't mean that you can't have an open discussion about it with them.
  Beyond the physical realities of this, I find it scary that they are being allowed to engage in a lifestyle that hould be reserved for adults. They really need a grownup to guide them- it doesn't sound like your ex is acting like a grownup, letting two kids live together like that. They are waaaay too young for such a serious relationship. If you're able to talk rationally with your ex, I would ask her why she thinks this is OK.  Of course she's probably trying to save your son the pain of being separated from his gf- but this is a very temporary solution! Does she really think that they will be together forever? What about college- if your son wants to go to college, are they going to apply together and live together then too? That is pretty much gauranteed not to happen. My fear would be that your son is getting trapped by his own desires and will not be able to break free even if he should want to. Or his gf will get restless and leave him devastated. Too much potential for heartbreak and lost futures here. I'm not sure if you have thought of going for full custody or if it would be possible, but that could be the best thing for your son. I know your ex is only trying to make the kids happy, but sometimes they need to suffer short term for long term gain. Good luck- I really feel for you in this situation.

[dlr2007]

Oops, just noticed this is only til the end of the school year! That makes my post a bit too dramatic- sorry about that. So worrying about college and all that is kinda jumping the gun, but I would still be concerned about the rest of it. Kids get attached to each other SO easily- after living together for a couple months, it may be very difficult to part them. This is really something for you and your ex to talk about- even if this time turns out OK, if you have much more conservative limits than her, more problems are likely to arise in the future. But I'm sorry to have misunderstood and gotten carried away :)