Most Helpful Guy
If she had agreed out of her own free will then that will not be considered as taking advantage.
Most Helpful Girl
No, not unless she had been diagnosed with mental retardation or some other legitimate mental condition that prohibits her from being able to make that decision wisely. If she's a grown woman who's mentally able then by that point, she's a consenting adult who has agreed to willingly be used. If you choose to willingly be used then you must be realistic about what happens after the deed is done.