I didn't take it as frivilous, although I am prepared to be so about most things in life!
I always think that life is far too important to be taken seriously. Oh and "sex" is such a small part of any true relationship anyway. If you are going to have a happy long-term relationship then you need to be able to talk about the important things of life - like how can a bee fly when it has been proved scientifically that it is too heavy to take off.
The solution I prefer is that bees are only a projection into our dimensions of a pan-dimesional entity, and thus use energies in those other dimensions (or maybe their local dimensions' equivalent of a heliun ballon) to provide lift that is otherwise not obtainable in "our" dimensions.