Anonymous

A lot of times depression has these effect on men. To find the real answer to your problem you need to go in for a check up to make sure something else isn't going on in your body.

Anonymous

Could be a lack of testosterone too, but a simple blood test can determine that. It could also just be temporary, but see a doctor if it doesn't go away.

Anonymous

Medications, drugs, Stress, Depression and some illnesses. Oh, and Worry.

Anonymous

Any number of things. Stress, hormonal fluctuation, illness, and a lot more other things too numerous to list.

Anonymous

Mumps virus.