Yeah, I'm pretty sure Cosmo editors ran out of actual "ways to please your man" some time ago, and have taken to inserting ancient tribal mating rituals into their polls instead. I'm pretty sure knitting needles are not "the keys that unlock my nipples' sensual potential."
I'd encourage everyone to try new things in bed, and guys in particular. It's a great way to learn trust, communication, and how to get each others' rocks off in new and exciting ways. So sure, if it interests you at all, give it a shot.
But there's a difference between "trying something new" and "doing something you don't want to." Trying menudo is a mite different from wearing powdered wigs and squatting on a spark plug (I learned THAT the hard way--in court). If you're sure you're going to get nothing out of an experience but intense pain, then by all means, veto the maneuver.
A willingness to try a new move now and then will keep her happy, and may just leave you happier as well...but there's nothing wrong with telling your loved one "believe it or not, I don't want that part of you inside that part of me."
Seriously, Cosmo has some evil stuff in there. In the Hebrew one they also had an interview with a guy's penis... with little penises with speech bubbles all over the page. It was weird... but they were all circumcised... still weird...
Well, nice to see some deference to tradition.
Cosmo in all languages, you are BAD at anything relationship-related. Everything there operates on some alternate plane of reality (the same one most rom-coms are set in).