The fact that you are feeling guilty for something you consider to be unhealthy, and using that as an impetus to STOP the action, is something that a lot of girls (like me) would admire.
For example, I want to wait till marriage for sex; if a guy that I date has been sexually active, and has enough respect for me and self-control to change to a non-sexually-active lifestyle for the purpose of our relationship, I would be honored, and not hold his past against him.