I want to talk
What is it that you want to talk about?
I want to talk about my feelings after having sex.
While I am glad you are able to talk about your feelings. Some things are best to keep to yourself. This sounds like very personal, private information.
It's nothing that needs to be private, I just wanted to tell you about how my penis feels.
Actually, that's exactly the kind of thing that should remain private. Most people aren't interested in hearing you talk about your sex life. Maybe try talking about sports or the weather instead.