Thanks!
Moving back from the biological basis to the introspective level, I'd expect the high-prolactin afterglow state to reduce anxiety enough to compensate for decreased motivation. (This might be related to whether one gets wired up or sleepy after sex, which has surprisingly large individual variation.) Easy enough to set up a randomised trial.
high-prolactin afterglow
You probably meant high-oxytocin afterglow.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.