Until the late 1960's, marriage was the best guarantor of regular sex.

Many experts suggest seeing a doctor if no pregnancy occurs after two years of regular, unprotected sex.

In a tight moment, he offers to feed her if needed and says it would be regular sex, as little blood as necessary.

Twenty-nine years old and she was having regular sex.

You know you're just jealous because she's having regular sex and you're not.

Frequent periods and heavy bleeding may be further non-inducements to regular sex.

It was probably also not an excuse that being with Bill had accustomed me to regular, spectacular sex.

We usually keep human concubines since they like regular sex.

It may sound obvious, but regular sex increases your chance of getting pregnant.