xtra prize 

What one person can give to another person of the opposite gender as a reward; can be received in exchange for many gold stars.

Jenn was very aroused by Tommy and so she decided to give him xtra prize on the sofa.

xtra prize by aperson April 25, 2005

xtra prize 

a euphemism for carnal knowledge, redeemable in exchange for many gold stars

Kat gave Ben his hundredth gold star, so now he can get xtra prize!

xtra prize by nostalgicrunner February 16, 2010