the problem is that you are using select lists, like I said in my previous reply, the manage relational table behavior will not work with select lists, you need to use check boxes.
Add a checkbox to the page named size. you will need to set the value in code view. go to code view, place the cursor between the quotes for value, in the bindings panel select the id column from the size recordset and click the insert button at the bottom of the bindings panel
go back to design view, and select the size checkbox, then on the server behaviors panel, click the plus button and select Repeat region, use the size recordset, and set the repeat region to use all records.
repeat these steps for the gender checkbox.
for use with the manage relational table, the checkbox names should contain the  characters at the end.