For me it is much easier to not drink when I'm not harming myself with superficial (i.e. FWB) relationships.
I won't get into sexual relationships with someone who isn't available and willing to build a long term relationship. It just leads to confusing emotions and someone is definitely going to get hurt in a FWB relationship - I don't want it to be me. I can't see having sex with someone unless there is love and trust - and that takes a lot of time to develop. Why lessen myself in that way?