Foreskin hard to pull back Watch
Also, make sure your partner is lubricated as that may exacerbate the problem, and watch out for splitting your chin-strap which is another common occurrence when starting out but has no long term effects.
I speak from experience
In the past when having sex without protection my foreskin has come back but has been very sore when pulling back making sex very uncomfortable and it is hard to pull back soft or erect to cure this is it just a simple case of doing some streches? Cheers guys