Even though both stars signed releases ensuring neither of them had cold sores (caused by the herpes virus), the actress insisted on rewrites so she didn't have to get up close and personal with Sheen, according to TMZ.com.
Lohan was reportedly concerned about Sheen's wild past, which includes lots of partying and cavorting with various woman (not unlike Lohan's own past). A couple of years ago Sheen displayed erratic behavior (including claiming to have tiger blood) and at one point was caught with a porn star in a closet by police officers.
In the film, Sheen and Lohan have a scene in bed together, but producers were purportedly forced to hire a body double for the kiss.
Despite the odd request, the two stars apparently got along pretty well because Sheen wound up lending Lohan $100,000 to pay off some debts. She thanked him by sending him a bouquet of flowers, but only after he complained that he never heard from her after he lent her the money.