“Can I remove my garment to have relations with my partner?”
Yes, of course, even if you fall asleep without it. There are always exceptions to the rule. The treatment of lymphoedema is not intend to be definitive, but it improves the quality of live, allowing everyone to do the best they can do in that conditions. Consistent compression is important but there are times when you need to be without compression. Just make sure that you are monitoring your limb and that any increase in swelling is addressed quickly to avoid problems.