Ejaculoathing
The sudden onset of revulsion, distaste and self-recrimination immediately following completion of the sexual act. Often accompanied by the realization one's partner is actually quite unattractive, deeply annoying, and perhaps best described as a serious error in judgment. Under severe cases one may vomit uncontrolably, struggle with depression, endure withering ridicule and ultimately withdraw from usual social circles.
Given his history, Bob really should've known that in the end he'd suffer from ejaculoathing.