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1.
Oral sex, usually a blow job, that's initiated by someone as a kindly or courteous gesture. A courtesy suck can also refer to a woman who allows someone who's obsessed by her breasts to suckle her nipples as a courteous gesture - term coined by Mark Hänser of Boston, MA.

Synonyms: courtesy fuck, pity-fuck
1.Josh was such a pathetic dork, but after he blew his paycheck taking Monica out to dinner and a movie, Monica took pity on him - she found Josh's puppy-dog crush on her oddly endearing - and gave him a blow job. But it was purely a courtesy suck; she had no intention of swollowing, let alone letting him cum in her mouth.

2. Mike was so obsessed by Aurelianne's massive, pillow-y breasts and she, in turn, was so flattered by his attention to them that she allowed him to suckle her nipples while he carressed his manhood - a courtesy suck.
by Victor Felix September 15, 2005
 
2.
Oral sex, usually a blow job, that's initiated by someone as a kindly or courteous gesture - term coined by Mark Hänser of Boston, MA.

Synonyms: courtesy fuck, pity-fuck
Josh was such a pathetic dork, but after he blew his paycheck taking Monica out to dinner and a movie, Monica took pity on him - she found Josh's puppy-dog crush on her oddly endearing - and gave him a blow job. But it was purely a courtesy suck; she had no intention of swollowing, let alone letting him cum in her mouth.
by Victor Felix August 21, 2005