We're obsessed with sex on television, in music and in advertisements. Most adult human beings naturally desire sex. And despite the rightwing emphasis on concepts like "purity", having sex does not actually make you a dirty or "impure" person. On the contrary, sex is like most other pleasurable things in life – you can have sex in ways that are fulfilling, fun, good and generous, or you can have sex in ways that are harmful, bad and dangerous.