1. Just because your friends do it, that doesnt mean you should feel the need to do it too.
2. It's a personal thing, everyone has different tastes. Just get into the mood, and do what feels nice and right. Theres no right way to do it, there's no wrong way to do it. If it feels good, carry on. If it doesn't, try a different approach. Simple! Use your hand, or have a look at some internet sites, there are so many ingenious ways to do it.
Hope I helped.
Lauren. x