As it is dealing with a highly sensitive area, initially I would have to reply noncommitally here... (read: I have no clue. LOL)... but my husband tells me I'm a quick study, soo-ooo...
Given further review, though...receiving would be maniacally difficult for me and I am a "long-nails" freak, so most likely topping would be first, given my propensity for control. 😀