8- Don't lie
Always be honest about your intentions, although not blunt. Use euphemisms; instead of coming out and saying, "I'm seeing other women at the same time as you." Instead, put it this way: "I really like that you're a fun person, because that's what I need right now — somebody to just have a good, casual time with."
You've been clear about your intentions, so she can't feel misled. And if you say this fairly early on, you've taken control by setting the tone. After that, there's no "talk" that needs to happen, unless things seem to be developing more amorously than planned.