U.S. residents are starting to put more into variable annuities and variable life insurance policies, and they are particularly interested in domestic bonds and international investments.

Financial Research Corp., Boston, has published data supporting that view in a report on March variable product net flows.

Variable product stock, bond and money-market options took in $2.1 billion more cash than they lost in March, up from a net outflow of $1.3 billion in March 2005, according to FRC.

The FRC flow totals exclude the hot new lifestyle funds and other “funds of funds.”

But the FRC flow figures suggest that investors are going after higher interest rates on debt securities at home and hoping the strong performance of international investment funds in the recent past is predicting strong future results.

The net flow of cash out of domestic stock and bond variable product options fell to $468 million, from $1.5 billion.

But the net flow of cash into corporate bond investment options increased to $791 million, from an outflow of $342 million, and the net flow of cash into international investment options soared to $1.9 billion, from $334 million.