Is it possible to build a sort of device that,when applied to the penis,stores the sperm discharged during non-voluntary wet dreams?

I ask this seriously as a man who's interested in passing on his genes,but will refuse to masturbate(the very word means "to defile one-self),also imagine the Shame of a child conceived due to a masturbation!

I imagine a sort of cold pot, with a sponge around the opening,might keep the semen in ideal conditions for donation.