OP - I read this post and your introduction. I'm a single female and have, as usual, been bombarded with emails from SM. Some of the things I have learned as I've gone along are these:
1. If a SM sends me a message, I don't want to read how big your dick is, how you are the best at eating pussy, how you'll be the best I've ever had. You don't know me and don't know what I've had.
2. If there are pictures I want to see more than just a dick picture. If you're a man I'm going to assume you have one.
3. Be willing to exchange a few emails so we can get to know each other a bit. I'm not here to fall in love but...there needs to be some connection for me to have sex with a man.
4. I don't want to hear you bad mouth your ex-wife, current wife, ex-gf, current gf.....and so on. Gives me the impression you are an asshole.
5. Just because I'm on a sex site does not mean I'm an easy, quick fuck. I have needs & desires that I am exploring now. I'm not looking to add notches to my bed post, just want to have some good friends that I can be sexual with.
I've used the word you in here but please take that as a general you, collective of many SM looking for women, not a specific you. I don't know if you have a profile on a site but if so, your chances at success will be better if you try to treat women you want to meet as a woman, not a fuck toy. I am going to assume this will be for many couples also.