If he doesn't have a chip, you could do him a BIG favor and have him neutered so he won't be thinking of girls all the time. If you want him to stick around, the neutering will calm him down, reduce his urge to roam therefore extending his lifespan.
Ahem,
It really doesn't work. Lance Armstrong just announced that he is going back to the Tour De France and recently he was linked to one of the Olsen Twins and Sheryl Crow before that....
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