sexing Blue Spot Jawfish

[foreverfortune]

i just purchased a blue spot jawfish the other day. i made him a diy home but i guess he decided that he was a better builder than i am so he dug out his own, beside mine.
have had no troubles with the introduction, i just dropped him in and he started making his home within 10 min, and readily ate when i feed the tank.
he is so neat that i am already thinking of finding him/her a mate. only problem is i cant really find any real info on how to tell male/female apart. have read some info saying males have bigger head, have 2 dark spots around the head. and 2 males will fight. the only sure way to sex is durring mating when male goes through a color change. but i need to find a pair before i can even see the color change.

heres some pics of mine dont know if male ore female. anyone have any links that may help? thanks