well this doesnt happen to me im married to alex goth and we sleep together all the time
you probably have something in the way of the bed and of of ur sims cant get there if
thats that the reason than i dont know what is

u hav u relax on bed then click on husband/wife then click relax on him/her then he/she
will be in bed wid u
:)

I think you can do this with friends to best friends
:P

you can do it with any one,you hafta control them both though and have a two person bed
with it open on both sides.

If your have a double bed that is next to a wall move it to the middle where it's NOT next
to a wall. But if you have 1 single bed just remove it and buy double bed and place it in
the middle then they will sleep together

Make sure there's nothing in the way of either side of it, and they should.

Well put one person to relax the when the first person is relaxing then put the next
person to relax. Then click on romantic on one of the sims. Then click whoo hoo or try for
baby. They can not be tired.