People's psychological behavior ..?

I'm keeping a Gripmaster (I guess it is a product name but I don't know how to call it... It's a tool to strengthen your fingers ;-?) on my desk at work. I borrowed it from Nao and I've been keeping it for a long time. Trying to use it now and then to strengthen my fingers to become a great guitarist ;P

I just noticed recently that people come to my desk and talk to me grab this gripmaster and use it while they are talking to me. They don't really realize what they are doing and after finishing the conversation, they just put it back where it was and leave. I was also not noticing it, but the other day, I saw this gripmaster in somebody's hand and since then I started seeing people doing this.
It's similar to people doodle while they are on the phone. People may feel comfortable when they use hands while they are talking... :-?

But a funny thing is only guys do that so far. Well, maybe less women come to my desk, so it's a bit hard to analyze it, but I thought it was kind of interesting.
Something like a gripmaster is more grabable by men?
Hmm... I'll investigate people's behavior more... :-}

I shouldn't forget to clean the gripmaster before I return it to Nao... It is going to be a full of germs.. ;P (gomen!)