[header] How to determine the sex of a lovebird [title] Give your lovebird a physical exam. [step] If you are just curious about the sex of a lovebird, and are comfortable with the possibility of being wrong, a physical exam can give you some clues. For example, feeling the distance between the pelvic bones can help you determine the sex. 
[substeps] Female lovebirds need more width in the pelvic region in order to pass eggs through it. This means that you may be able to determine a male from a female by comparing the width of several lovebird's pelvic bones.