Childhood's End (1996)

A story of two teens discovering their budding sexuality. Greg is having his first sexual experience and first relationship with his friend's mother, a woman twice his age....while Denise is angry with Greg, and sleeps with another girl. Both are in a hurry to mature, but both must deal with the repercussions of growing up, moving out, and leaving the security of childhood behind.

Unfortunately the movie Childhood's End is not yet available on HBO Max.