Not marrying. But, we'll have glorified BODIES. I doubt we'll be walking around without our genitals. What are we going to be? Smooth "down there"?? Why?
Now, how would it be done, I do not know. No marriage, so how would it exist? But, there is a lot about Heaven we do not know. Most of what we know is that it will be "perfect", which seems to be open to very subjective interpretations.
We'll have bodies... we'll enjoy sensual things like music and food and amazing sites... why would sex, the highest form of physical pleasure, be denied in Paradise of all places?
Anyway, we'll all find out soon enough.