1) The point of orgasm during sexual intercourse.
2) The moment you smack your load all over your
partner's body during a
tit-wank or a
hand job or something...
3) The point of orgasm in any situation, be it masturbation or otherwise.
1) "Oh darling, I have just reached my
sexual zenith."
2) "Oh bitch-ass skanky ho, I be
reachin' dat sexual zenith right now."
3) "Glen reached his sexual zenith as he pressed his jap's eye into
the handkerchief."