Especially these last 10 years I typically feel a little drained after sex. I deal with it by never having a punt in the day time, unless I had no work to do for the rest of day.
I guess the general things for boosting your energy help - make sure you get some exercise, have a good diet or if that's hard take vitamin tables, make sure you have a good mattress for restful sleep.
Its interesting that for much of history there was a strong belief that sex was draining for men. There used to be a theory in Taoism, esoteric Christianity etc that if you don't have sex & you don't wank, you'll have more energy for work. This was in folk wisdom to, it used to be the fashion for football managers to tell players not to have sex the night before a match. This was from the top division professionals right down to the Sunday league games I used to play in. Interesting that advise seemed to have gone out of fashion by about the late 90s, but I think it's still true, at least for some of us. The word to search for for is sexual sublimation, if you're interested in this topic.
Another thing is, for some reason this summer people seem to have been reporting feeling more fatigued than normal:
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