Definition of "philandering"

She wont be convinced by anything short of it; because, you see, I've had some tremendous philanderings before, and have gone back to her after them.

1893, George Bernard Shaw, The Philanderer

Straight critics […] were shocked by the explicit depiction of Peter's sexual philanderings, scenes that in 1977 are ho-hum in their shock value.

1977 April 23, David Holland, “Hockney: Portrait of the Artist as a Cuckold”, in Gay Community News, page 15