Fiona struggles to be more spontaneous to spice up her relationship; Marcus finds out being a boyfriend isn't all it's cracked up to be.

Will trolls for booty on Valentine's Day - will he find true love instead? Christine Woods guest stars.

Will pulls out the stops at a school charity event to prove he's not being paid for sex. Chris Diamantopoulos guest stars.

Will's efforts to write a hit song are derailed when Marcus moves in. Greg Germann and Chris Diamantopoulos guest star.

Will pretends to be gay to win over a music producer; Marcus and Fiona catch each other in a web of lies.

While Fiona tries to break her chastity streak, the guys celebrate their "manniversary" by stalking Marcus' idol, Lisa Loeb.

With the lawsuit pending and "Runaway Sleigh" playing everywhere, Will gets bah humbug for Christmas. Dax Shepard directs.

Fiona recruits Dakota and Will to chaperone her first real date with Mr. Chris; chaos ensues. Leslie Bibb and Chris Diamantopoulos guest star.

Fiona's hot for the new drama teacher, who's got Will competing for Marcus' attention. Leslie Bibb and Chris Diamantopoulos guest star.

Marcus' affections alienate Shea; Will finds the woman who's been messing with his money.

A first crush puts Marcus on a collision course with his Princi-Pal. Izabela Vidovic guest stars.

While trying to break Marcus' Halloween curse, Will tries to get his post-Dr. Sam groove back at his annual Halloween party.

When the move to New York looks final, Will and Marcus pull out the stops to find each other new best friends. Adrianne Palicki guest stars.

In financial crisis, Will returns to San Francisco where Marcus has made new friends and Andy has a baby crisis brewing. Rob Reiner guest stars.