As fast as possible, I also get them off the SA site to a text app, or google voice for texting, etc. Be witty, be erotic, but tasteful, then as it heats up push the boundaries a little to make it clear you want a NSA good time and will be PPM and looking for a recurring relationship because you are so busy at work making money you have no time to date or have fun, etc. I also like the idea of letting them know you have a GF or wife so a seed is planted why after the first couple of dates, you moved on and am busy.
While 98% of the SB's I've met are willing to just come over without any prior coffee date, I will say that a few times I wanted to meet them first because I thought they were too good to be true. I met them, gave them $50 for meeting me, and they were all just as I hoped -->hot, sexy and fun. I should probably stick to that formula to avoid the ROB's, but so far even the I'll be right over girls have worked out for me.
I have never had a bad SA date except one hot college girl who had the start of a yeast infection and once I got a whiff my dick just went flat. The 18-20 year olds are the most likely to jump your bones or "think you are clean" and start BBFS. I just don't understand why they are clueless about safe sex. I remember one amazing Asian girl jumping me However, and then saying you better pull out before you cum as I'm not on birth control! Before that comment made me limp, I pulled out and put it in her mouth to shut her up.
The 25-30 year olds are the hot spot. They are comfortable with themselves, still look 20 years old, and understand the transactional aspect of the SB relationship.
Overall, there are a lot of normal girls that just need money and for them sex doesn't mean anything special to them. That is another reason to be careful to avoid STD's as I know they are (or were) also partying and fucking dude's right and left. Another benefit is many SB's seem to love to let you take their sexy/naked photos. I know one guy who allowed a girl who took photos of them having sex with her iphone then she blackmailed him.