I waited two months after getting mine but I wasn't in a relationship at the time.
You'd probably be fine for sexual acts that steer clear of the clit and if you clean up afterwards. The place I got mine supplied antibacterial soap (which has since come handy for my mooncup).
I'd say as well if you do get it done be aware that at first you not only feel the pinch when you sit down but also when you cough, sneeze or yawn. Well I did anyway. Very strange.

I'd fully recommend a VCH. I've had no loss of sensation. An adjustment to how I go about things (can use the ball on the ring to stimulate myself).