I have regular sex with a partner, between 1-6 times per week. I masturbate rarely perhaps once per month. My sex life has a pattern whereby I have sex after a few days rest, then continue to have sex once or twice a day for a few days then generally stop for a few days up to a week. After the inital sex, I notice that I have much more anxiety, social awkwardness, in some cases social paralysis. I have get a syndrome characterised by dry mouth, sensitivity of the penis and general higher pain sensitivity over all the body, general feeling of stress, lowered mood, lowered drive (almost apathetic sometimes), clear headed and alert, although concentration is poor, generally tense although socially as long as I can stay still I can fake interactions sometimes more easily. This gets worse the more times I have sex after the initial, until somehow leveling out after 3 or 4 days of having sex, then I am disinterested in having sex, and so go for a while without it.
In contrary, a week without sex my motivation is much higher, anxiety lower, social anxiety pretty much gone.
I know there are some general effects from sex and motivation here, as our biology is set up to make us work for sex and when we get it, our motivation drops somewhat; many people experience this and I think it is quite normal, but the extent of symptoms I get don't really make sense to me.
Interestingly, I get an almost similar effect from taking fish oil supplements or eating fish, however, with fish oil my concentration is far better, but the general anxiety / social anxiety is similar in this regard. I also get affected similarly by caffeine, several hours after.