This is interesting because it helps address the problem of how do you know an advance is unwelcome without doing something that could be considered an advance.

This is interesting because it helps address the problem of how do you know an advance is unwelcome without doing something that could be considered an advance. It avoids the awkwardness of having to ask that question "are you open to advances?" before actually making an advance. However, relationships are formed over time, and romantic and sexual relationships are often serendipitous. It's up to each party to communicate effectively and unambiguously if misunderstandings are to be avoided. Using this kind of app/service/record-keeping sounds just as interesting/desirable/sexy as having to ask that question point blank (that is not at all). Is there really much difference between "Would you like to go out with me?" and "Can I ask you to go out with me?"