They DO HAVE CLUTCHES, to operate brake bands, they have one called a sprag clutch also that operates as a roller clutch for routine up downshifts.
Mondeo's for example are famous for breaking the fingers on the CLUTCH basket, a extremely similar set up to a wet clutch on a m/bike.
They don't have a clutch that operates in the normal way as on a manual box.
Automatic boxes such as on Ferraris(paddle shift) have more clutches as they can preselect as well.
tabetha