Your vag is like Pavlovs dog...... It drools when it thinks its getting a treat!
Actually yes, we are creatures of habit. There are times when I am doing certain things and I will find myself doing something or feeling something that is hobby related.
For example... when I check into a new hotel room when traveling, I'm always checking the closet and bathroom for a hiding pimp.
When I enter a larger hotel, like a hilton or marriott, I do play spot the provider if its really busy.
In hotels I pick up my towels... at home I leave them on the floor for maid service.
When I get into an elevator at a hotel, I often look around to see who saw me get in..... guilty look on my face no doubt.
So yes... I think its rather common that our behavior or evne our bodies respond on memories of activities and situations like that.