If you want a friend with benefits thing, present it to her that way. It's easy. Men always seem to think us girls are these fragile, delicate emotional balls of issues. Truthfully, it's because men never know what they want, and they always want to dance around these things, that messes us up. I have always made my intentions clear when engaging in sexual activity with someone. For example, if I want it to be casual, I let them know. If that changes, I let them know. If I think I have feelings for them, I let them know, and etc. We only want the same respect from you. Tell her exactly what you want. Don't [kitty]foot around it. Easy as.