Eating meat is natural. But there are so many harmful 'unnatural' things that we do as a species that if we can do one beneficial one, I'm down.
I will tell you that as a vegetarian the orgasms aren't any better, but I can't say for sex because I didn't start having sex until after I was vegetarian.
Oh and generally PETA are an emotionally terrorizing organization. I stopped liking them... ever. Though I have to admit their tactics are to get people to talk... and it clearly works. They believe that animals have equal rights to humans and that mind set is not for everyone.