It doesnt quite fit in the poll answers but I send exit link traffic to my own non-adult product.. not a sponsor.
IMO there is no downside to exit links and they are no traffic "leak".... If a surfer clicks an exit link they obviously dont want to be there..
IMO Links to Google have no downside, but the rumours about better rankings with links to SE's are just that rumours... believe what you want..
DD