40 Tex. Admin. Code §§ 819.121–819.136 § 819.123

(a) It is unlawful to discriminate based on race, color, disability, religion, sex, national origin, or familial status by imposing different terms, conditions, or privileges relating to the sale or rental of a dwelling or to deny or limit services or facilities in connection with the sale or rental of a dwelling. (b) Prohibited actions under this section include, but are not limited to: (1) using different provisions in leases or contracts of sale, such as those relating to rental charges, security deposits, and the terms of a lease and those relating to down payment and closing requirements based on race, color, disability, religion, sex, national origin, or familial status; (2) failing to maintain or repair or delaying maintenance or repairs of sale or rental dwellings based on race, color, disability, religion, sex, national origin, or familial status; (3) failing to process an offer for the sale or rental of a dwelling or to communicate an offer accurately based on race, color, disability, religion, sex, national origin, or familial status; (4) limiting the use of privileges, services, or facilities associated with a dwelling based on race, color, disability, religion, sex, national origin, or familial status; and (5) denying or limiting services or facilities in connection with the sale or rental of a dwelling because a person failed or refused to provide sexual favors.