Although it often struggles to be heard in respectable circles, there is an alternative to the Christian-Romantic tenet that sex and love should always be inseparable. The libertine position denies any inherent or logical link between loving someone and needing to be unfailingly sexually loyal to them. It proposes that it can be entirely natural and even healthy for partners in a couple occasionally to have sex with strangers for whom they have little feeling but to whom they nonetheless feel strongly attracted. Sex doesn't always have to be bound up with love. It can sometimes - this philosophy holds - be a purely physical, aerobic activity engaged in without substantive emotional meaning. It is, so its adherents conclude, just as absurd to suppose that one should only ever have sex with the person one loves as it would be to require that only those in committed couples ever be permitted to play table tennis or go jogging together.