Yes you can.
Yes, you certainly can. Go to the doctor.
Yes. That's where most STDs on a man are
probably an std
Go to the doctor. You could have a STD.
Gangrene.
No unless you have an std.
If he didn't have a STD and you misteriously get one from him.
Yes unless he has a STD.
get yourself checked, it's most likely an std
If you have crust on your penis, then you need to see a doctor to get it checked out. You may have an STD that needs treatment.
Condoms are used on male penis to prevent pregnancy and STD transmission
This probably means that you have an STD (Sexually Transmitted Disease)
Unless one of you has a STD or is unclean there are no side effects.
If it's dirty, then just wash it with soap, but if you had an STD, you need to go to the clinic