"My girlfriend keeps making excuses as to why she's not into sex with me. E.g. stressed from work, just doesn't really like sex that much, has to get up early. Is this bullshit, or are these actually things girls care about?"
She sounds pretty lazy, dude. I suggest you watch 'he's just not that into you', absorb its message, remove your balls from her iron grip and tell her you want to start having some sex. If she still makes excuses, its your call. You can either be a man or be the kind of man who hangs out on cuckold forums, asking what brand of ball gag is best to wear for when her lover comes round.
