what you & your girlfriend need is to have a laxative prior
to any intercourse, yes the laxative if applied properly will
loosen her bowels and help her relax, lubricate and numb the pain
of vaginal and anal walls during intercourse.
Go to the provision shop and buy abt $5 worth of coconut milk then
ask her to drink but not all of it, very soon she will feel the
urge to urinate and defecate, during urination and defecation oils
from coconut milk now consumed will naturally lubricate her vagina
and anal walls, she would also feel very relaxed after that, thats
when you shud penetrate her.
Pour the rest of the coconut milk on your penis prior to any
penetration.
that should help some 
