The initial idioms of the letter S

seven	seventh
seventh heaven	seven-year itch
sever ties with	several
several bricks short of a (full) load	several cards short of a (full) deck
several irons in the fire	sew
sew something up	sew up
sewed up	sewer
sewer hog	sewermouth
sex	sex, drugs, and rock 'n' roll
sex goddess	sex object
sex on a stick	sex on legs
sex pot	the sex talk
sex up	sexy
sex-machine	sexual
sexual congress	sexual relations