Samantha Ronson fears that Lindsay Lohan will soon lose interest in their sex life, it's claimed.

According to a new report, the DJ is keen to marry her actress girlfriend before fickle Lindsay tires of her dalliance with lesbianism.
 
"Lindsay's always been rampant and loves sex. Sam just doesn't know whether she will be able to keep her satisfied," a source tells Closer.

"She's hoping that getting married will really seal the deal."

The pair have been constant companions since the beginning of the year but only confirmed their romance earlier this week when Lindsay told a radio host that they have been together for “a very long time.”

But it seems Lindsay is showing no signs of getting fed up with Sam's neediness just yet.

The source adds, "Sam wants to be with her 24/7 and is incredibly possessive - but Lindsay seems happy with the situation."