This story on Humans of NY got me thinking a lot about how I want to talk to my kids about consent.
http://www.humansofnewyork.com/post/147915173276/it-was-the-summer-between-8th-and-9th-grade-we

My oldest is going off to kindergarten and I've heard In play language both from her and her friends 'well then you're not going to be my friend anymore'. I know it's typical kid behavior but I want to start talking to her about other people's choices to start laying a good foundation about consent.

Also how to make sure she's OK with saying no boldly to something when she's uncomfortable, whether it's sex, drugs, or whatever other activity. As much as I want her to only interact with great people she's going to interact with people that are manipulative and try to discount others feelings and opinions, so I want to start having conversations to prepare her for when it happens.
So I guess does anyone have any insight, phrasing they use, books they read to help these conversations develop from a young age?