...it's not showing love to your spouse...
Its wrong not to show love to one's spouse. Nobody is disagreeing with that. It its not done with care and respect then its being done wrong, but I don't see why you suspect there is a particular form or position that does this more effectively.
All sex is pretty gross. Its not as if there is a neat and clean version of it. I remember hearing about sex for the first time. I knew immediately it was a disgusting process, silly, ridiculous. What I didn't know at the time was how messy it was. There is no way around that without using medical equipment.
I have held back during this discussion to get in to why this is perverted sex. I don't want to get in to the details because it's obnoxious to me. I used to work for an organisation called Southern Electric. It was a male dominated workplace and you'd hear conversations at times about the sex lives of some of these people. I've since left that place, but I know from what I heard there that oral sex is not pleasing to Yahweh. It's not a characteristic of Yahweh's Holy Spirit. A lot of these sexual acts such as anal sex, or oral sex, are perverted and they exhibit a wrong spirit. They show hate, not love. If you can't tell the difference between good sex and bad sex, then I feel you need to read the Bible.
Men and women both hold darkness in our hearts I think. Jesus is quoted to say the problem is not what goes into a person but what comes out of their hearts. Its true that men (and women) have a desire to dominate, to control, to oppress and to injure. We don't about this as children, and its best children don't know. When we enter a relationship we have to make sure not to express this evil, too; but you can't control it merely with outward rules. I think you can't fix this with the missionary position or any other. You can't fix it, because evil comes from the heart. You can be kind. You can avoid hurting your spouse.
Relevant scripture I wish to point out:
Col 2:21-23 NIV "
Do not handle! Do not taste! Do not touch!"? These rules, which have to do with things that are all destined to perish with use, are based on merely human commands and teachings. Such regulations indeed have an appearance of wisdom, with their self-imposed worship, their false humility and their harsh treatment of the body, but
they lack any value in restraining sensual indulgence.
Gen 6:5 NIV The LORD saw how great the wickedness of the human race had become on the earth, and that
every inclination of the thoughts of the human heart was only evil all the time.
Mat 15:19 NIV For
out of the heart come evil thoughts--murder, adultery, sexual immorality, theft, false testimony, slander.