I think that it is a good idea to give it a "rest" for a week until sutures are removed and your soreness has abated in most cases. Best to ask your surgeon.
Always a good idea to discuss this stuff with your specific plastic surgeon but I would say wait 48 hours. By then, your fluid balance and dehydration should be normalizing and you are less likely to get dizzy. It is normal to have some numbness around the genitalia if significantly swollen.