Each individual has their own comfort levels and desires, and what works for one person may not work for another. It's always a good idea to have an open conversation with your partner about likes, dislikes, and any boundaries before engaging in any sexual activity.
Because of studio porn, many people have a misconception about sex. When a guy has sex for the first time, he tries to repeat what he has seen in porn, and to his surprise, it doesn't work.