Relationship and sleeping arrangement

My girlfriend and I have been together about about a year. We are both 45 with 2 kids each. She has two girls (12 and 15) and I have two boys (12 and 15). For various reasons, we have a long distance relationship until the kids go of to college. We know this is several years down the road but we are both committed to the relationship and have talked about getting married when the time is right. So our question revolves around the bedroom and sleeping arrangements. When she comes to visit (sometimes with her girls, sometimes without) and my boys are in the house, we don't sleep in the same room. Basically, any time 1 or more kids are with us for the night, we sleep separate. Neither one of us knows what is appropriate in this situation. All 4 kids are do well in school, are respectful and in general, just good kids. Separately, we have told the kids that it's not ok to sleep with someone unless your committed and plan on a long t erm relationship with that person. I'm trying to send the right message to the kids. By not sleeping together, are we sending the wrong message? Should we continue this practice of sleeping separate or is it ok to make arrangements to sleep in the same room while the kids are around? No clue! TIA!

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