Wiktionary
get physical
vb. 1 To begin to make physical contact: 2 # To begin to make physical contact aggressively (as part of fighting or playing sports). 3 # To begin to make physical contact sexually (as part of sexual intercourse); to have sex.
Usage examples of "get physical".
Of course we don't have assholes here you understand somebody might go and get physical.
If he decided to get physical-and she remembered from their youth that it was very possible-she didn't have a prayer.
What if she'd spent all night wishing they could get physical, too?