Casually and confidently walk through the front door. What's there to fear or feel guilty about? Your question ought to be, "when visiting a MP, do you guys opt for a quick rub-and-tug or slow and sensual VIP service?" I suppose it all depends on one's sense of thrill and adventure! LOL
Front door, just as if walking into any other place of business.
Most MPs are located in relatively discreet locations.. I'm more likely to "dash in" to the Brass Rail (given it's on busy Yonge street) than any of the MPs I've been to.