Can you have sex with an umbilical hernia ?

Yes but: You may need to be gentle. Most importantly, if it is strangulated or the contents are pulsing, get it fixed immediately.

Yes: All activity should be done as tolerated. If it hurts, take it easy. That's usually a good guide.

Yes: If the hernia causes significant pain at any time, it should be fixed. After surgery, depending on the size and type of repair, you may need to avoid intercourse for 3 weeks or so. If you don't have surgery, you can have sex, although you should take it easy if it causes pain.