sexpert

noun

informal a person who professes a knowledge of sexual matters

Word Origin for sexpert

C20: a blend of sex + expert
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for sexpert
n.

"sex therapist," 1924, from jocular merger of sex (n.) + expert.

Online Etymology Dictionary, © 2010 Douglas Harper