P V ratio
How many guys are there compared to girls at a party. Usually means there's not enough girls.
There were 20 guys and 1 girl. P V ratio was 20 to 1. The girl was getting vibes.
The party had 5 guys and 2 girls. The ratio was 5 to 2. Still not good enough.
At the party, there were 10 guys and 1 girl. The ratio was 10 to 1. The girl was tired.