No person in connection with, or incidental to, the making of a loan may require the borrower to enter into any collateral sales agreements or contracts, other than the contract of pledge, assignment, or mortgage of personal property, or if otherwise permitted by this chapter, the deed of trust, mortgage, or lien on real property, by the borrower to the lender as security for the repayment of the loan and charges on the loan. Private mortgage insurance, mortgage guaranty insurance, credit life insurance, and credit disability insurance are not prohibited by this section.