Leviticus 20:13 (King James Version)
"if a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them."
,What is sexual intercourse>
When a man and woman engage in sexual intercourse the man inserts his erect penis into the woman's vagina. Now let me ask you this, What is the keyword here? Is the keyword INSERTS, or are the keywords PENIS & VAGINA. i would say the latter for they are sex organs wheras insertion is just a byproduct of procreation.
In short, Leviticus 20;13 is not a blanket condemnation of male homosexual behavior, but rather a prohibition against engaging in ONE specific (disgusting and pointless) act.