Don't touch my wife ... don't touch my bike ... don't touch my guns ...
Yup, good one right there. Most people who ride know not to touch another guy's bike. What clueless people do (who don't ride) is go up to it, swing a leg over and pretend to ride it while yanking the throttle open.
Idiots. GET OFF MY BIKE.
But back on topic, it's just preference and not trust. There are people I trust with my life but I wouldn't give them my Debit card and pin #.
I don't lend guns out, and I don't ask to borrow guns.