Journal: "girlfirend" for $75K per year as my concubine, totally wrong?

Based on my current income and utter lack of interest in the cult of hetero marriage, is it so bad that I would offer an exceptionally attractive woman a retainer salary and 401k for providing me with my nerdy and co-beneficial physical needs? I mean seriously, cant we just be best friends with benefits and make those benefits realistic, given our current economy?