An obligation arising out of considerations of right and wrong. When not giving a head would be considered morally offensive.
Because Ryan had to listen to Jen bitch about her problems all night he knew she would become orally obligated to suck his cock.
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Not being able to turn down a kiss after receiving oral sex.
Shit man, she gave me head but I forgot about Oral Obligation.
The thing on every man's mind after receiving head is oral obligation.
My boyfriend is so weird about Oral Obligation, now I make out with him for 20 minutes after Oral on purpose!