What is this redness? And why is it super sensitive under my foreskin now?

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My wife and I had a typical "quicky" before we left the house last week and in the midst of it all it started to feel uncomfortable for me which i know sometimes is understandable because of the foreskin. But unlike all the other times, this time I continued to go on knowing i was uncomfortable until it started to hurt a little bit. At this time i stopped and tried to correct myself so i can continue. The pain felt like I was stretching my foreskin if that makes sense. Now since then my penis has been really sensitive and a little build up of smegma (cheese) continues. What do i do? What can help me? Is this an infection?

Sounds like possible thrush. Just keep it clean and use a moisturiser.