Green’s Dictionary of Slang

(US) sexual intercourse.

1974		(ref. to c.1960) in Lighter HDAS I 410/1: ‘“Go looking for chome” is one I haven’t heard in years. It means looking for cunt. It’s from Quincy, Mass., about 1960, maybe earlier’ .
1977		(con. 1969) M. Herr Dispatches 29: [They] said they never heard a grunt talk about anything except cars, football and chone.