What makes you choose her to provide duos with you?

Has wrought the confusion of your fanbase.

Are you asking the client......"what makes you choose a duos tandem?"

Are you asking a provider......"what makes you choose another provider to team up with?"

What makes a provider choose a particular provider to duo with?

...some have 'types', some think it will help their business, some are attracted to a certain type of woman, etc.