35 year old magician's exploits alone

Marian (age 35) is a magician who has been a bounty hunter for 20 years.
She is a very skilled magician who always completes the tasks she accepts.
She is misanthropic and proud, and has accomplished everything on her own.
During one of her quests, she receives a powerful curse.
To break the curse, she is told that she must swallow a large amount of sperm within a certain time, regardless of her race...