Yes, INTERCOURSES is a Scrabble word!

Letter values in Scrabble US: I 1, N 1, T 1, E 1, R 1, C 3, O 1, U 1, R 1, S 1, E 1, S 1.

Is it a valid word?

INTERCOURSES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

communication between individuals
the act of sexual procreation between a man and a woman; the man's penis is inserted into the woman's vagina and excited until orgasm and ejaculation occur

Also: social intercourse, sexual intercourse, sex act, sexual congress, sexual relation, carnal knowledge.