Not offensive, but a good piece of advice from Horace:
Saturarum Liber I, II:126 &seq:

Nec vereor, ne, dum futuo, vir rure recurrat,
Ianua frangatur, latret canis, undique magno
Pulsa domus strepitu resonet, vepallida lecto
Desiliat mulier, miseram se conscia clamet,
Cruribus haec metuat, doti deprensa, egomet mi.
Discincta tunica fugiendum est ac pede nudo,
Ne nummi pereant aut puga aut denique fama.
Deprendi miserum est: Fabio vel judice vincam.

Why you shouldn´t sleep in a married lady´s bed...

Acerbus