Don't tell me you are with one?!
Besides nymphomaniacs don't exist. There are just a male fantasy. No woman can satisfy a male's hunger for sex.
It's more likely to be the other way around...
I've tried, competitively or just for a small recreation (or lack of it thereof

): football, road cycling, cross country cycling, long distance running, basketball, volleyball, handball, tennis, table tennis, rafting, paintball and maybe something else that I don't remember. If I'm not active for a long period, I'll be completely wasted in the first day of a long distance running training or cycling, since I normally do it at my home town, which is in a mountain area. But since I have a reasonably good endurance for a normal person (heart rate per minute between 40 and 50 at rest), after a week or two I'll be ok (at least until I hit 30 in a couple of years and get a surprise...). Football and most other team sports can be tough, but depending on the level of the people you're playing with, your position, and how you manage your effort, it is perfectly bearable, unless you're not very strong and they put you as prop in your rugby team.
As far as water sports, I only experimented rafting, but if I had to bet, I'd say that for me that most demanding would be rowing. I never did it, but once a rowing exercise machine came into my hands and I practiced on it for a while. Unlike running, for example, it was always tormenting, and I could never get the better of it, whether I was in shape or not, or had been trying it for some time before. It always felt like having been beaten up after just a very few minutes, so I'd go for rowing. But that'd be for me, because like Hitro says, depending on your physical characteristics it can be something else. I have no body elasticity whatsoever so I could never perform any sort of gymnastics exercising, but I bet many gymnasts couldn't climb a mountain on a bike either.