BL is used at times in USA/Australia but is more commonly known as shonen ai (romance between two males) or yaoi (more explicit relationships, 18+)
In yaoi, the 'shou' is known as 'uke' and the 'gong' is known as 'seme'
Normal couples/love is known as 'canon'
BoyxGirl is known as het (short for heterosexual)
some other helpful stuff:
OTP - stands for One True Pairing, or your favourite couple
Shipping/ship - when you pair two people together
I hope that helps a bit ^_^