Hi L and welcome! Im mono too and this forum has helped me with some issues with me and my poly gf.
The main thing I have to keep telling myself is: "It has nothing to do with me. It has nothing to do with me. How can it have nothing to do with me? IT HAS NOTHING TO DO WITH ME! (I know krazy right?)
For me, I give my friends a hug, not all my friends, but the ones Im close to totally get a hug. My gf related having sex for her is like hugs for me. Yes they are very different but the concept of intimacy is similar.
Hope this helps