“Chaser” is the informal term often used to describe intense post-climax cravings that can follow orgasm, immediately or perhaps the following day. They likely arise from neurochemical changes naturally triggered by climax.
Men who give up online erotica (and with it, very frequent climax) often report changes in post-climax cravings. They say that the intensity of the chaser eases over time as the brain rebalances.
Daily Sexual Desire and Its Impact on Next-Day Desire and Behavior in Mixed Sex Couples
Testosterone and sexual desire in healthy women and men