Questions: Girl's Behavior

I really need some help on what to do here. I've been in the college town I'm in for about a year, but I actually grew up overseas... military family. Because of my build, I was given a job at the door of a club where a lot of the U students come. There's a $5 cover most nights. The school year is over now but I'm really worried because of fall coming up. See, my job is to collect the cover charge, check ID's, etc. I'm outside the club, not a bouncer inside. Well the owner was getting impatient and worried because by spring break he started bringing up how the club isn't bringing in what he thinks should be the norm. I didn't say anything but I know why. It's because... smh... probably 75 percent of the college girls are really cute and have gotten by me easily. Like 9's. College girls in the States it's like UH😮. And when I try to collect the cover a lot of em will just use their looks on me. Tilt their head over and have a really cute face and I just dunno what to do against that! I had 1 brunette at the end of the year I remember use that on me and I'd already caved in to so many I was determined not to this time but I didn't know what to do so I looked into her face with her head tilted over and a cute face and my mouth started dropping and I tried my best but all at once my mouth just fell open and she raised her eyes up and went😊😊. I let her by and just gave up, humiliated. I need the job honestly, but I can't beat these college girls, they're too good at that.😩With fall coming up I'm worried. What should I do?