Here's a curious coincidence: no sooner do I speculate on the relative merits of furious spin-bike training and furious self-abuse than the Daily Mail knock out a lifestyle piece along pretty much the same lines. Compare the respective dates: my blog post appeared on April 13th, the Mail article on April 15th. It's almost as if someone at the Mail, maybe even Paul Dacre himself, is reading this blog for inspiration.
The Mail article plays down the likely calorie-burning benefits of masturbation as compared to something like going for a jog or to the gym. On the other hand with some of those there may be a cost involved, and you have to do tedious administrative things like put some trousers on. Swings and roundabouts, as always.