What majority of guys still watch porn whilst in a relationship Watch
The majority of guys who still watch porn whilst in a relationship is a minority.
"The percent reporting “never” on personal pornography use were:
57% of casually dating women vs. 25% casually dating men
60% of seriously dating women vs. 25% of seriously dating men
61% of engaged women vs. 38% of engaged men
65% of married women vs. 37% married men"