split the reed 

to gently or forcibly elevate a female's legs to encourage deep penile penetration. generally followed by enthusiastic pelvic thrusting and premature ejaculation.

a combination of the words "split" (a positioning of the legs at an awkward angle) and "reed" (a plant which flourishes in swampy conditions).

I failed in my attempt to split the reed when her wooden leg snapped on the headboard.

split the reed by robust russet October 23, 2008