Deion Sanders wife says he'll only give her money in exchange for sex!

Pilar Sanders claims Deion Sanders is holding her as a "financial hostage" ... completely severing her cash flow ... and has only offered to give her money in exchange for sex ... this according to new court papers obtained by TMZ.

Pilar has filed an emergency motion in a Texas courtroom ... claiming the NFL legend has canceled her credit cards and left her without any financial means to support herself and their children ... and she needs the judge to force Deion to give her money so she can survive. 

In the docs, Pilar claims, "Since Deion filed for divorce on December 21, 2011, he has given [Pilar] $300.00 and offered her money in exchange for sexual favors."

Is a Wife LEGALLY supposed to put out????