well its the face but I have met girls with great eye contact and great sex faces hahaha which is actually the biggest turn on more that anything for me really but doggy well you cum faster and you'll get out of the place faster also with missionary you finish there you kind off fall beside them i dont think they like that cus you have to chat then haha, and
when she tickles your balls it means hurry up probally why the room is so warm too ,its all business at the end of day get them in and out as fast as you can