Is it normal to feel less sensitive on sildenafil?

Yes. ED medications (Cialis, Viagra, Stendra, Levitra) all reduce sensitivity and make and more difficult to ejaculate. The good thing or not so good thing is the woman. You can definitely last longer and pleasure your woman to your hearts desire. However, some women actually don't prefer long sessions.. but some do.

Five Causes of Decreased Penile Sensation and How to Get it Back

Cialis, Viagra, and scores of others, some more exotic in origin, are popped like Hubba Bubba in hopes that penile sensitivity returns. What some men don't realize is there are other ways to fight decreased penile sensitivity that doesn't rely on little blue pills. Some take a simple identification of the cause to find the remedy.