[NSFW] If you do this a lot, does it hurt? See inside.

OK, I can’t really ask anyone else its too embarrassing! So I would rather be embarrassed on Fluther. The question relates to both men and women. If you have a lot of sex, does it hurt after a while? Or is it just me? I thought for a while it could be an age thing, you know atrophy all that (I know!!), but I do recall always being this way. I do use lube, but just regular lubes, are there any special ones? I’d really appreciate any feedback.