Cup size has more than one meaning at a new central Maine coffeehouse. Servers are topless at the Grand View Topless Coffee Shop, which opened its doors Monday on a busy road in Vassalboro. A sign outside says, “Over 18 only.” Another says, “No cameras, no touching, cash only.” Thursday, men, women, and couples were customers at the new cafe where a handful of topless waitresses and two bare-chested waiter served up $3 coffee and $2 donuts. The coffee shop has been opposed by dozens of residents when it went before the town planning board last month. Town officials said the coffee shop met the letter of the law.