Good sex isn't just about the act itself ; the nuances before and after can help determine whether you have a positive sexual experience. From engaging in foreplay before sex to having good pillow talk after, it all adds up. Some people don't quite understand the social rules of post-sex conversation, however, and it turns out that it's pretty easy to kill the mood once sex is over with one short sentence. Redditors share some of the most awkward things a partner has said to them immediately po…