whatsgoingon

Normally the head of my penis doesnt smell at all.
And my sperm doesnt have a weird smell to it too.
But when I don't clean it well after, it smells after awhile. I know its because I didn't wait for the last bits of sperm to come out and I just fall as sleep.
before even if I don't wash it it still didn't smell weird at all. but now if I dont wash it and wait for the last bits of sperm to come out. It will smell weird somewhat fishy atfer a while. why is this happening now?
It never smelled before even if I don't clean it untill the morning after.
It just started. why is this happening? STD??????