I have produced a custom taxonomy in Wordpress 3.1 known as Gender with BOY and GIRL as groups.

function build_taxonomies() {  
register_taxonomy( 'gender', 'post', array( 'hierarchical' => true, 'label' =>  'Gender', 'query_var' => true, 'rewrite' => true ) );

I am trying to produce a front-finish form that customers can submit data but can't learn how to produce a checkbox which will populate the BOY and GIRL fields under Gender. Something similar to this...

Gender: <input type="checkbox" name="gender" id="boy" />Boy
<input type="checkbox" name="gender" id="girl" />Girl <br />

Any suggestions for a noob much like me? Thanks!