My eye was caught by this in The Times today:
Q My partner is a fitness fanatic and she only ever wants to have sex after a workout. It’s great when our endorphins are racing and we’re a bit sweaty, but sometimes I would like it to be after a romantic dinner, like a normal couple. Why doesn’t she fancy me at any other time?
A There are lots of physiological explanations for why your girlfriend likes having sex after a workout. Vigorous exercise releases endorphins, chemicals that act on the brain to block pain and create feelings of exhilaration, happiness and calm. Exercise also increases blood flow to the pelvis and the vagina. If your girlfriend is doing a lot of core exercises, such as squats, leg lifts or planks, she may be in a heightened state of arousal by the time she gets home. It’s not uncommon for exercise sequences that place a lot of pressure on the lower abdomen, hip flexors and inner thighs to bring some women close to (or even spontaneously to) orgasm.
I have never had a girlfriend – or even a wife – who was that keen on PE. Apart from the obvious point (a bit late for that), no regrets there.