Joan's Birthday Suit
S2:E8
2001
IMDb
On her 30th birthday, Joan grows depressed at the realization that she hasn't had a lot of excitement in her life. She determines that she will live life to its fullest in her thirties, and demonstrates her new philosophy by taking her friends to a nude beach--where they run into her father. Meanwhile, William suggests a pre-nuptial agreement to Yvonne, and is surprised by her response.