Ask Jessie about her reputation.

Jessie tells you that she has build her reputation from nothing. There are two kinds of people in the school. Whores and whores. She giggle at her own joke but proceed to explain that School whores are some of the best spellcasters in the whole land.

Just hearing a spell cast can sometimes be enough for Whores to cast it themselves. On the other hand many students and school whores have been consumed by lust and sex. The only way to prevent losing your mind in this school is apparently to either be a hard ass taking advantage of people to satisfy your needs, or embrace the sex and lust and hope you don't loose your mind in the progress.

She has chosen to build herself an empire of best casters in the school and as such she has a reputation to uphold.