A bottle of wine worked wonders for me and the now wife.
Step 1: go to the store and buy a semi nice bottle(not BOX) of wine (but not too expensive)
Step 2: Buy a nice bouquet of flowers.
Step 3: Go to her house and ring the door bell (keep flowers and bottle of wine hidden behind your back.)
Step 4: when she answers present the flowers first
Step 5: while she is shocked and distracted by the beautiful flowers, smash the bottle of wine over her head
Step 6: drag her back to your car and or house like a caveman and have your way with her
Step 7: have a good story about how she slipped an fell on her door step and you saved her
Good luck
Your results may vary, I can not be held responsible for possible battery/rape charges that may follow if you cant come up with a good enough story