A man who is looking for the heart/will of God in the matter will see plainly that God holds "seed" in high regard. Man had better recognize this. To play games of ignorance regarding this matter will be at your own peril! Man carries the "seed":
G4690
σπέρμα
sperma
sper'-mah
From G4687; something sown, that is, seed (including the male “sperm”); by implication offspring; specifically a remnant (figuratively as if kept over for planting): - issue, seed.
LXX related word(s)
H319 acharit
H1121 ben
H1320 basar
H2233 zera
H5209 nin
H5220 nekhed
Where a man is to put this "sperma" in not left a mystery in the scripture. Into a rectum is to do more than despise the "seed" man is given...I could give words to describe how utterly insulting the act is, but you can find your own. Word of advice, seek absolute understanding in this matter before you place yourself at odds with a matter that is of particular importance to God.