According to the Urban Dictionary website, “blue comedy” is “off-color, risqué, indecent or profane, largely about sex.” Worth noting, since Sex and How To Have It, the new offering from The Magnetic Theatre, is billed as light blue. The play (originally produced for two late-night performances last summer) is built around “quick, comic looks at sex education, first forays, gay sex, group sex, online sex, loss of libido, visits from the pizza delivery guy, the plumber, the police and ‘The Spouse Whisperer,’” along with songs and more. It’s conceived, written and performed by Brian Claflin, Kathryn Langwell, Glenn Reed and Magnetic Theatre newcomer Valerie Meiss, in collaboration with the theater’s artistic director Steven Samuels and writer Lisa Yoffee. Low-priced previews Thursday-Friday, Jan. 10-11, $8. Official opening is Saturday, Jan. 12, shows run Thursday-Saturday through Feb. 2, $15. 7:30 p.m. nightly. http://www.themagneticfield.com.