Testicles.

blue-veined junket pumper
boner
♥♥♥♥
♥♥♥♥
ding dong
dipstick
dong
dork
doughnut holder
firm worm
free willy
goober
hairy bagpipes
hang down
hard on
John Thomas
joy stick
knob
love muscle
love stick
love truncheon
male organ
meat
meat whistle
member
organic dildo
ol' one-eye
one-eyed trouser snake
pecker
pee-pee
pee stick
percy
peter
piece of pork
pink oboe
pole
pork sword
prick
purple-headed trouser snake
♥♥♥♥♥ plunger
rod
root
salty dog
schlong
skin flute
spunk stick
stiffy
throbber
throbbing python of love
tool
trouser trout
wanker
wee-wee
weiner
weinie
wife's best friend
willy
woody