As a general rule, stars having an image of partying too much limits sponsorship opportunities, which means less revenue for you and your manager. Endorsers don’t want to log on and see entertainers and athletes being promiscuous, cursing and excessively partying and drinking. They will skip right over you for endorsement deals, as not fitting with their brand and it will cost you money.
Endorsers and sponsors don’t want stars representing their brands, who engage in said conduct. It would damage their brand. As such, it results in corporations foregoing sponsorship deals with such athletes, costing you hundreds of thousands, potentially millions of dollars in endorsement deals as an athlete.
And over what? Partying and being promiscuous with women whose names you will not even remember. Years down the road when you have trouble paying your bills, you will regret those choices. Put things in perspective and realize having a career in entertainment and sports is limited and you have to make the most of it while it lasts. Don’t destroy your earnings capabilities by making poor choices.
Often stars in their teens and twenties think they're indestructible and know it all. The sad fact of the matter is they have a lot to learn about life. Rule number one, it is better to learn from other people's mistakes than your own, especially when your own cause you to crash and burn.