What a load of attention seeking bullshit!!! 
His girlfriend literally went on social media to say, "I can't be arsed to have sex!" What an arsehole! It's maybe because I'm British, but this bullsit just bores me to death. Why not just roll over in bed and say, "Ere boyf/mate/chap, not sure what's up but I've lost my mojo and I can't be arsed with sex and what not."
EVERY FECKING WOMAN IF SHE HAD TALKED TO THEM, "Oh hun, go get you hormones checked out, your testosterone is LOWWWWWW!!!" 
Fucking nutters obsessed by labelling themselves!
Saying that, OP could just be such a shit rat that her vag has just said, "Noooo, thank you..forever!"