Cum on back

How does this work for you? I had a chick come over who I've banged twice before but in public, like in my truck and in a video booth. Well this time we get real at my house. Now I pull out all the stops, break out the dildos and everything. I get this girl squirting all over this towel and have her shaking and trying to crawl away. So now I got her doggie and I'm pounding away and ready to cum. So I rip off the condom and blow the load on her back. She flips out because I came on her back. She tells me it's disgusting. That I should have shot it in her mouth. So she gets up and takes a shower. I think we're all good. Get this. I'm lying in bed and she gets dressed and leaves. WTF.