The experienced PUA will always attempt to build a LTR first, if the HB is high on the physical attractiveness scale. However, some things cannot be forced. If personality and core values are significantly incompatible, a STR can be established based on sex. Both partners know this will not go anywhere, but decide to have fun while the moment lasts. It is possible for STRs to turn into LTRs through a major act or event; however this is rare.
Erica is only good for an STR.