Need advise

I am new to this site, but I love it. I really want to comment on pics and vids, but not sure how it will be taken. No comments that are rude, hurtful or nasty but just things like "i would love to slide my dick in or I wish I could lick your pussy". but I'm not sure if that is ok especially if the comment is about a lady in a relationship. I am kinda shy and don't want to offend anyone, but there are a lot of pics/vids on here I just love. Any advise?