1
general::
Phrase(s): go all the way (with someone) [and] go to bed (with someone)
Euph. to have sexual intercourse with someone. • If you go all the way, you stand a chance of getting pregnant. • I’ve heard that they go to bed all the time.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
1. Continue on a course to the end, as in The town agreed to put in a sewer but would not go all the way with widening the street. [First half of 1900s] Also see GO THE DISTANCE. 2. Engage in sexual intercourse, as in Her mother told her some boys will always try to make her go all the way. [Slang; second half of 1900s]
American Heritage Idioms