It depends. If you’re telling a story then yes, if it’s just porn then no. The set up can be part of the kink to people. So like ONEPIECE is currently in a Japanese culture arc, so yes having kunoichi Nami or geisha robin fucked in a Japanese setting adds flavour

I always add background and I hate make background more than anything else

I appreciate detailed backgrounds and don't mind simple one color backgrounds. However, I can get distracted if the quality of the background is different than the quality of the characters even if the characters were well drawn.

yes, commission are always about a story in a way for me. So background is probably one of the most important details

Thanks everyone! This is useful information!

I’d say no yet when there isn’t one it just doesn’t feel right. Doing a simple bg is the perfect compromise imo.