No.

As long as it's done in moderation and not interfering with your daily life, nope. Once you start cancelling plans with friends/family or you miss work/school to watch porn then it's a problem.

I feel it is a personal thing if you feel guilty then don't do it.

Depending on the circumstances, it could be, but generally I would say no. That answer changes if it starts to interfere with your daily life or your relationships. Carrying expectations over from porn, which is a byproduct of watching lots of porn more often than most are willing to admit, is also bad. As long as you keep in mind that porn is not always representative of actual sex between a couple (or more, if you add people to the mix, haha) then that's fine. I also agree with the above - if it makes you feel bad, then it is not worth it.

Nope, it's never bad to watch porn. Unless you have a spouse that thinks it's bad, then you'll have a problem.

This is an odd site to ask this on haha.

No bad