I like to imagine that Reputation is code word for "Pleasure".
1. There is a limit - you can only give up Pleasure to people 5 times per day. I raised this from 4 on May 16, 2012 to encourage Pleasure giving (and to make up for increasing the Pleasure threshold from 100 to 150)
2. You need to give Pleasure to 10 different people before you go back to the same person. This is to prevent some people from... handing each other Pleasure over and over again to pad the Pleasure power.
Ah... the world is a better place with... "Pleasure".