Well you and his ex-girlfriend are two different people. Your bodys are different. You could try and do manuel sex before you have sexual intercourse. That might make him last a little longer.
I say experiment see what both of you like, and what makes him last longer.
I dont know if that helps you any, but I hope it helped a little.
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*~*~12/3/99*~*
Bobaroony & Erica Bearica
<3 love forever!
*~*Scarleteen Advocate*~*