Can grief cause a sudden change in sexual behavior. and sexual obsession making a man suddenly be attrached to other men as well as women and cause primiscuious behavior and deviant sexual behaviour?

Hi Aloneatsea,
Grief affects different people in different ways. In some instances it can tap into other issues and trigger unusual behaviors.

With regards to sexual behavior, grief most often impacts sexual desire / libido. If someone is suddenly acting out sexually after a trauma or loss, it is difficult to say what exactly is going on. This would probably be more typical of someone in his or her teens or early twenties, but it could happen at any age.

If the man you are referring to is a family member or significant other, I encourage you to talk to him (gently, not in a pushy manner) and encourage him to consider talking to a therapist because you are concerned for his wellbeing. Promiscuous sexual behavior is risky and can be dangerous - especially if it includes unprotected sex or involvement with strangers who may have ulteriour motives.

I do hope this person finds a way to work through his grief, which is a difficult but necessary process. A therapist can help guide him through the painful process.