Your penile skin has lost its natural hydration due to regular contact with soap and other forms of body wash when you shower.
Wash you penis with water only and make sure it is completely dry afterwards by using a clean dry towel, preferably a towel that only you use.
For hydration get some Liquid Coconut Oil that is for use on skin rather than hair, apply a very light coating every other day, best time is after you have dried yourself after a shower.
This is a dermatological issue, not related to the sex you had.