Lovebird gender?

I have two lovebirds, but I don't know their genders. In my book, it said that when mating, the male would be on top of the female. When I observed my birds, the position would sometimes change. PS. please don't say anything about taking them to the vet,...

or by holding them in some way, because I haven't been able to touch them. Thank You!!

Most of the time in the bird species, the male is the one with the brighter, and prettiest plummage. We had lovebirds at one facility I worked at, but truthfully I don't remember the color of them.
What I DO remember quite vividly is the male is the one who has the crazy, maniacal laugh ---and he does this most *after* they have mated. The females do not seem to make the crazy noises!! (=

* Hens tend to be sturdier and heavier in build.

* Males often have more intense coloring.

* The female will sit on a perch with her legs spread
further apart than the male.

* Females bite harder.

* Nest building activity is stronger in the female.

* Males feed the female.

* Tail feathers flare differently when birds meet. Females show

the tail feathers to be of the same length (straight across),
males hold the feathers slightly nipped (rounded).

* Males sit outside nest box during the day

* Females sit inside nest box during the day.

* Females more aggressive protecting their territory.

* Females are usually dominate.

* Males sometimes abuse chicks.

The most reliable way is: females lay eggs.
link

An anal inspection can be done but takes experience in sexing these birds to make a fair determination. Basically there are two bones called the ossa pubes on the ventral side of the pelvis and the female will be spread wider apart than the male.

If you cannot tell for sure which lovebird is male or female,
a veterinarian can order a DNA or lab test.

http://pet.taragana.net/archive/how-to-tell-male-lovebirds-from-female-lovebirds/
Hope this helps!