No erection at all during visit with prostitute?

Along with not really having a connection like another answerer said, it can also do with your viewing of porn. Porn can be addicting and change your preception of sex. Cut back on the porn (particularly anything with extreme fetishes, feet and stocking is ok) get in a relationship, cut back even more on porn, then get laid. And don't ditch the chick afterwards. Make sure you care for her.