Undateable 9 and 9:30 p.m., NBC
The cast is likable, but the humor is all about bro one-liners. Chris D’Elia (pictured), from “Whitney,” is the guy with the moves, teaching his geeky friends how to make it with the ladies. He’s a leather-jacketed Fonzie by way of Barney from “How I Met Your Mother.” And newcomer Brent Morin brings energy and originality as the sweet guy who needs to learn how to talk to women. Too bad the writers don’t give him much to work with.
Masters of Sex 10 p.m., Showtime 2
This show returns for season two on July 13. In the meantime, Showtime is letting you play catch-up on season one, which is worth doing. “Masters of Sex” is a beautifully acted and smartly written 1950s period drama about the pioneering work of William Masters and Virginia Johnson. It contains plenty of sexual content, but it isn’t there to titillate so much as to show how sexuality works. It’s also about science, so primitive then compared to what it is now, and the cultural resistance at the time to talking about sex openly. In this episode, Allison Janney begins her powerful turn as the forgotten wife of a closeted gay man.
Fixer Upper 9 p.m., HGTV
A.k.a. Adderall while doing home repairs.
Maron 10 p.m., IFC
Masochism + Cats = Good Times.
L.A. Hair 9 p.m., WE
Too head-onistic for me.Matthew Gilbert can be reached at firstname.lastname@example.org. Follow him on Twitter @MatthewGilbert.