1. You'd better not eat together
One of you may want to eat before or after you have sex. This is acceptable. But I strongly advise you not to do it together. Eating with him in the course of the date seems to be something a couple should do. This will give you the illusion that you are dating. So try to avoid eating with your friends with benefits partner.
In any case, you should avoid anything that makes you feel like you're dating. Eating is a relaxing thing. Eating with your partner can create emotional connections. If you feel hungry, you can bring some food.
2. Don't give gifts to your FWB
When you are in a serious dating relationship, in order to please your date or on an anniversary, you will choose a gift for your partner. It should be something that happens in a romantic dating relationship, not in a NSA relationship. If your partner wants to find a relationship with you, you give him a gift to increase his expectations; if he just wants to stay in a NSA relationship, your behavior may embarrass him. In order to avoid these troubles, you'd better not give him presents. Of course, if it's on a special day, such as his birthday, you can give him a gift. But remember, this gift should not be too expensive, just like you give it to your ordinary friends.
3. Don't hang out
You need to make sure your connection is only in the bedroom. When you establish this FWB relationship with your friends, your friendship will change a little, and it will become more sensitive. Maybe some of the things you and your friends can do won't work in this relationship. Don't hang out with your partner alone. I'm serious. Be aware that any intimacy can ruin your relationship. Hanging out with your partner alone will make you more aware of each other's presence. This will make the connection between you more close. The best way is to leave his room right after you've had sex with him. You should try to make your relationship clean and pure. As long as you don't mix too much emotion into this relationship, it won't go bad.