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Is it a good idea to go to a fancy dress party as 'premature ejaculation'?

Only wear pants and say: "I came in my pants"?

Would you find that funny?

Hey there,
You can try looking at some other funny costume ideas, like 3d sperm http://www.wwfdo.com/adult-fancy-dress-costumes/comedy-and-clown/3d-sperm-costume
or condom man: http://www.wwfdo.com/adult-fancy-dress-costumes/comedy-and-clown/condom-man-costume
or this one: http://www.wwfdo.com/adult-fancy-dress-costumes/comedy-and-clown/breathalyser-box-costume
or a naughty one: http://www.wwfdo.com/adult-fancy-dress-costumes/comedy-and-clown/69-male-costume
Hope this helps!

Wear a nice causal dress maybe....
Not something that stands out too much. :P
I wouldn't wear pants thou.. unless they were like nice 'Lulu Lemon yoga pants' or something.
I wouldn't wear a huge fancy dress thou. too fancy.
Find out what everyone else is wearing.
Good Luck and Have Fun! :-)

mehhhhhhhh bit immature

just steal some of your friends clothes and go as your friend, that always works ;)

I'm guessing you're a boy are you trying to tell people something?

Deff not the way to get a gf!

Not terribly funny. I wouldn't recommend it.