No guarantee that this will finally put the issue to rest, but the NCAA has released the results of a survey on male practice players. 65.7% of Division I schools responded, 34.6% of Division II schools (tsk, tsk) and 40.4 of Division III schools. The news release states

Survey results show widespread use of male practice players in all three divisions — most prominently in women’s basketball and to a lesser degree in volleyball and soccer — and most respondents said male practice players don’t change how the non-starting members of a team are used in practice and don’t affect the number of grants-in-aid schools award to female student-athletes.

For details on the results, check here.