I've always been a fan of seeing the gender icons on the profiles. You can do this by simply adding them to the appropriate LANG fields.
For the ladies:
Female <font color="#F5A9A9"><b>♀</b></font>{text key='base+questions_question_sex_value_2'}
For the guys:
Male <font color="#81BEF7"><b>♂</b></font>{text key='base+questions_question_sex_value_1'}
There you go.
Looks like this:
This may not work with all plugins, if they can't parse the HTML in the lang key... I think Hot List is one of them...