Does moisture coming from inside a husband's penile opening count as impurity that necessitates purifying clothes and bedding, especially after touching and verifying it in the context of obsessive-compulsive disorder?

Indulging in obsessive thoughts about impurity is an evil gateway that corrupts both religious practice and worldly life. The dampness you perceive might be an illusion, sweat, or a trace of water used for istinja' (washing after relieving oneself), so it does not necessarily have to be impurity. You must disregard these obsessive thoughts and pay no attention to them. Even if we assume there is a small amount of impurity on the hand, it is among the things that are excused by some scholars.