rib ‧ ald /ˈrɪb ə ld/ BrE AmE adjective
[ Date: 1400-1500 ; Origin: ribald 'person of bad character' (13-19 centuries) , from Old French ribaut , ribauld , from riber 'to sleep around' ]
ribald remarks or jokes are humorous, rude, and about sex:
a ribald remark
ribald humour