The National Enquirer claims that the Modern Family star's wealthy businessman beau is a 'sex addict' who regularly indulges in multiple-partner cocaine-fuelled orgies.
Two prostitutes came forward to the publication and alleged that they have both had 'intimate encounters' with Nick.
A woman, who goes by the name of 'Cindy' told the magazine that Sofia had no idea that Loeb was cheating on her.
'Sofia's in the dark!' she said. 'Nick was willing to risk his future with Sofia for his own selfish pleasure.'
The second woman Bianca believes that Nick is addicted to sex.
'I think Nick is definitely a sex addict,' she said.
'He just can't get enough. He'll party with anywhere from two to five girls, usually in luxury hotel penthouses, with porn playing on all the TVs, lines of cocaine laid out and liquor flowing like water.'
Bianca claims that Nick takes Viagra and provides the girls with Ecstasy tablets to ensure that they have a good time.
'He takes large does of Viagra and provides sex toys, lingerie and drugs, including Ecstacy. He doesn't use it but he likes the girls to take it because he believes it makes them enjoy sex more. His favourite thing is to watch two women make love while he has sex with another girl.'
According to Bianca, Nick told her that Sofia wasn't into the same things as he was when it came to the bedroom, and that is why he turned to sex workers.
'When I asked Nick about his sex life with Sofia he said, "She's not into what I like,"' Bianca told the magazine. 'He told me "Sofia won't even talk about it."'
Nick's racy behaviour doesn't apparently just stop there. The aspiring politician also reportedly likes to visit strip clubs, according to the publication.
There, he allegedly pick up girls, pays them $1,000 and takes them home.
In Facebook and phone messages obtained by the National Enquirer, Nick allegedly tried to set-up sex up sex parties with Bianca, but once said he couldn't interact because Sofia would check his phone.
The women allege that Nick was once nearly caught out by the Modern Family star when she called during one of his parties.
'Sofia would call in the middle of an orgy,' Cindy told the magazine. 'Nick would grab his cell phone and bolt. When he got back, I asked, "Does Sofia know what you're doing?" He said, "No way! She'd kill me."'