We call 'em zucchini here in the U.S., and are some of the most prolific plants around. No need to 'artificially inseminate' them... The male flowers tend to stand up and away from the vine and have a 'stamen' in the middle with noticeable pollen that you can see and feel, whereas the female flower, almost immediately, has a baby fruit between the flower and the vine. The flower also tends to be along and closer to the vine. In the center is a the "stigma", which must receive the pollen in order for the fruit to develop.
Here in small town, western U.S., August is the only month that one has to lock their car. If you don't, the neighbors fill them up with surplus zucchini (courgettes).