And as an additional update, most earring holes don't close fully. I haven't worn one in over 10 years, and you can still see an earring hole. Especially if you went with a large gauge, which I didn't.
One looks ridiculous. If you're going to do it, just get them both done. And small studs are better than hoops.
Just DON'T. If you must, go with a stud, one ear, MUST be on the left ear as someone else said. That is the un-ghey-est way to do it.