Having a “friends with benefits” relationship can be very tricky for multiple reasons. These types of relationships usually end in disappointment and no one is left with anything. Sure they can be fun for a while but they are neither beneficial or helpful in creating an actual relationship with that person since they more than likely end negatively.
No matter how much you say it is strictly just a ‘friendship’ and nothing else, one person always ends up developing feelings for the other person. Its really difficult maintaining a “friends with benefits” relationship because becoming so intimate with a person is something that humans can easily do whilst NOT developing an emotional attachment. Its hard to keep emotions out of these kinds of relationships due to the fact that you are sharing something so personal with someone else.
Having a relationship like this can also ruin your friendship. Since it’s just a friend with benefits, it eventually ends and then there’s that awkward time where you’re not really friends with the other person but your also not enemies either. There’s no future with that person in the relationship usually so it either dies off and becomes an awkward acquaintance sort of friendship.
My advice is don’t do, and if you are, don’t have any feelings for the other person and don’t plan on developing any feelings for them.