Can a bar owner refuse service to a bartender's boyfriend?

My girlfriend just started working at a bar. The owner says that boyfriends of female bartenders (i.e. me) can't come in during their significant others' shifts, even if they pay full price for any and all drinks. He also REQUIRES all his female bartenders to wear tight clothing. The owner has instructed them that this is because they MUST appear "available" to customers. I'm 99.999% sure this is illegal. Am I right about that?