There is a difference between having sex once with someone and having feelings or having sport sex several times and having feelings. I have had a one night stand or two or three and and have not developed feelings feelings for the women. But recently I have been in a situation where this girl and I knew going in that we were going to have sex regularly (for fun) but without any strings attached. At first that seemed cool.... but I have come to realize that I did develope feelings for her. It is almost inevitable when you are intimate with someone and you spend time talking, holding, and kissing that person. I don't think I will do it again because if she does not have feelings for me and it ends it will hurt.