Ask yourself the following questions then proceed accordingly...
1) Am I lowering my standards for an easy lay?
2) Does she have a personality that outweighs her flaws?
3) Can you see yourself waking up on the bed beside her tomorrow morning?
4) Is she ugly compared to Anna Kournikova? or does she qualify universally as butt ugly, pug ugly, fugly, butt fugly, pug fugly or just
ugly ugly?
5) Is she someone you wouldn't take out in public?
6) Could you be out there getting a more well rounded (and by this I mean a mix of booty and pretty face) girl instead of settling for this?
7) Is her body really that perfect?
8) Do you have sufficient paper/plastic bags stocked at your apartment/house?
9) Have you actually seen the goods or are you guessing?
10) Could something be done about that face (i.e. makeup)?
11) Are you planning to ever call her back?
12) Could you take this girl home to mom and dad?
13) Do you already fantasize about f*cking other women while doing the deed?
14) Are you positive that not a lot of other guys have used her for the same purpose you're planning to?
15) Would the gained experience be substantial?
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Yes I pulled these all outta my ass but some are ones you should consider*