Unsatisfaction

And, too, I suffer a vague feeling of unsatisfaction, of regret, of almost remorse, from which I am seeking relief, and of which I shall speak in the last paragraph of this account.

Source: wiktionary

A very frequent cause of married unsatisfaction is the fact of the difference of time that it takes for the husband and wife to come to the climax, the orgasm.

Source: wiktionary