A month ago my son had four bi passes from a man and fooled around. Now his father wants him taken for psych treatment?

Sexuality not diseas. Sexual experimentation is a normal part of development, and is not a mental disorder. If your son himself has questions or is distressed by his own sexuality or orientation, then your son may wish to seek out therapy. But a father taking him for psych eval or treatment will only strain father-son relationship. Best to accept son & let him decide. Suggest std testing if unprotected sex.