Jaimee Grubbs: Tiger's 'Probably No' Sex Addict

Rumors are swirling that Tiger Woods has entered a sex rehabilitation program -- to save his marriage.

Kate Coyne from People magazine tells "Extra" that a source revealed that in late December, Tiger checked into The Meadows, an upscale rehab facility in Arizona, hoping to repair his marriage to Elin Nordegren.

"Tiger has been calling Elin nonstop, begging, pleading, to give him another chance," Coyne says.

Check out all the women who Tiger has been linked to

Rehab may help him patch things up with his wife, but alleged mistress Jaimee Grubbs tells "Extra" she doesn't believe Tiger is an addict.

"I would go with my gut and probably say no, from what I do know of him," Grubbs says. "Whether or not he hung out with these other girls for it, maybe."

"Extra" Lifechanger and marriage therapist Alisa Ruby Bash says that something traumatic may have triggered the PGA star's behavior. "I think with Tiger, he's had so much pressure put on him, having to always keep up this good guy squeaky clean image."

See what Tiger looked like as a kid

Woods has been out of the public eye for 47 days.

See photos of Tiger and Elin during happier times: