Can guys have an orgasm and not cum?

Avery

I have noticed a few times that I don't feel the hot cum either when he finishes on my skin or when I give him a blow job... I feel confused but too awkward to ask him about it lol

After realizing it at first I took note when I gave him a blow job last time and sure enough, no cum when he finished.

....Is this normal? What does this mean? Guys don't fake it do they...? lol