A boss has to interview 4 gals for secretary.He asks the same question to each of them

BOSS:A woman normaly has lips on two diffrent places....What is the diffrence between the two? 1st gal:One is hairy,the other one is not. BOSS: Ok...Good. 2nd gal:One can talk and the other one cant BOSS:Thats better. 3rd gal: One is vertical and the other one is horizontal BOSS:Mmmmh! Clever. 4th gal: One is for my use and the other one is for my boss.