Since Riley has been painted as a super stud in the past, it's amusing to find him suddenly suffering from performance anxiety. His therapist (Blake Clark) chalks it up to Holly being more than a one night stand.
Meanwhile, Al, who was originally skeptical of the concept of psychology, is impressed with his professor until he shows interest in dating Lizzie (Elizabeth Alderfer). Is Al jealous or just offended?
There's some missed opportunity to tease out Riley's performance issues with innuendo and wordplay, but the writers chose to steer clear of bawdy low brow humor, and of course, the virginal Al wouldn't be talking sex with Riley at all. This is USofAL, not TWO AND A HALF MEN after all, even though both shows are Chuck Lorre productions! There's not even a mention of viagra! The end result is an average half hour without any current affairs overshadowing the chortles.