sex on legs

better than sex

Superlative; wonderful.

eye sex

A lustful or sexually-charged glance exchanged between two people.

fair sex

Women collectively.

fresh legs

A substitute who has yet to play in the match, and therefore has more energy than those already on the field.

gentle sex

Women generally.

have legs

To have endurance; to have prospects to exist or go on for a long time.

land legs

A sense of balance, slowly regained after a time at sea.

open one's legs

Synonym of put out (consent to having sex).