Vaishnava Dharmashastra 53.4

53.4

puṃsy ayonāv ākāśe 'psu divā goyāne ca savāsāḥ snānam ācaret ||

For intercourse with a man, for unnatural crimes with a woman, (for wasting his manhood) in the air, (for intercourse with a woman) in water, by day, or in a go-cart, he must bathe dressed in his clothes.