As has often been said, aviation provides a highly fertile ground for sexual innuendo... all that stuff with flap levers etc. Two of the PPL instructors I had (well, not "had" but you get my drift) got students pregnant. Female students in both cases, though I guess that after 60-70 hrs (for some reason the female students always took a lot longer to get their PPLs, especially if they wore short skirts; one taking 100+hrs) one would get familiar enough for things to develop that the precise details didn't matter.... However, both being very upright (hoho) types, they married the girls.