Firstly, VINITO made me laugh so hard i have sore sides from almost pissing myself from laughing so dam hard.
Legend ! Love your sense of humour Vinito, Excellent.  
(and who said Americans didnt have a great sense of humour, Vinito shld be made a honourary Australian with that excellent effort etc)  

I like the slogan mentioned for a cheeky bumper sticker etc, but another one that women might find a bit more attractive /serious on a ladys car, might be something like the ones below  

For the second serious  design, how about "My husband likes it when I play with his balls" or "My husband has 4 balls, not two" or "I can see my reflection in my husbands Balls"
(ok, only joking) serious ones below >

"Great People, Great Fun, Great Hobby"
Aussie Pinball   www.aussiepinball.com.auor

"Join the Pinball Army, travel to new places, meet new people, and play with their Balls" (ok, joking again. I have only one serious one thats above.