More Philosphical Opposition on Friendship after Dating

Here's the thing dating involves going to the movies and having sex. Meanwhile friendship involves the sharing of you life with another person. You should be in constant communication with your friends. You all travel together, go to bars together etc. So if you and your dating partner can't even manage to get along while going to the movies and having sex why should you then promote your relationship to friendship? And what if that doesn't work out you'll then ask to be parent and child.