If i'm following your train of thought properly, i totally agree.
The whole abortion argument, to me, is an argument over the potential for life. So taking the fertilized egg-becoming-a-human a step further, each load that a man shoots into a rubber, or anywhere but into the vagina can be considered murder because each load is a potential life that will never be. Its almost like a slippery slope argument, if we ban abortions because there is a potential for life, we should go all the way and arrest people for wasting eggs/sperm because they each could potentially become a human life. Sex for pleasure should then be illegal etc.
I'm terrible at verbalizing my feelings, but i hope i got my point across.
this is a weak arguement, and i think you know it