No one has to drive and no one has to have sex. Having an accident while driving has a probability associated with it. Getting infected while sexing has a probability associated with it. You focus on sexing. I focus on driving. You worry about what people do in their beds while I worry about people do in their cars.
Repeated bad driving doesn't lead to the development of new strains of antibiotic-resistant bad drivers who can infect and quite possibly kill unknowing good drivers.