premature ejaculation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun During sexual intercourse, more rapid occurrence of ejaculation than a male or his partner desires.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The occurrence of male orgasm too quickly during intercourse

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun ejaculation during the early stages of sexual excitement or soon after the insertion of the penis into the vagina