If you're only sleeping with them and not concerned about the emotional impact or progress with a woman, I don't believe that wearing shoe lifts means anything. If she means more to you...then read on!....
Height is a factor with many women out there. Yes, that is true, but and ESPECIALLY, after a woman gets to know you more, height generally isn't nearly as important to a woman. This is why we see women say....., Oh, I could never date a short man, BUT, I would date Tom Cruise (5'7) or even a funny guy like Ben Stiller (Only 5'6). They already know these guys from the Hollywood movie screen and they are very attractive as a result of their amazing attributes. The challenge is getting a woman to know and understand you, while you're still short. That can take some work, especially if she has a preconceived notion regarding short men. All of this goes away rapidly, once she knows you, and once a woman is attracted to you; she usually will be attracted to you regardless of your height. Trust me. I know from personal experience, many times.
I used to wear significantly elevated shoes all the time. My Girlfriend (s), never minded. I think it has a lot to do with my confidence and overall attributes. I was a great guy and all of them would say to me that my height wasn't a negative thing. They loved EVERYTHING about me. They literally would say "EVERYTHING". Especially if you're a shorter male, a woman totally gets why a man would wear an elevated shoe; just as us men totally get why women wear a padded bra or bra that lifts/pushes, etc. I wouldn't concern myself with what women think of my lifts, and that is precisely why they didn't care. I was going to wear them whether she wanted me to or not, ha ha. Was a thing I did out of my own preference.
One more point - if the shoe elevation shoes prevent you from enjoying life with your significant other; like taking long walks, going bowling, or just lounging comfortably around the house; this can be a real problem. She has to feel that you're comfortable in your own skin. That is what will keep you desirable to her.
Good luck and feel free to chime in with additional feedback.
All the Best,
IFS