Leaving aside the interesting concept of designing by chance.
This God of yours seems spectacularly bad at design. For example until modern healthcare women were at an uncomfortably high risk of dying in childbirth. Why did God design women that way?
I don't have the answer, if I were a woman I might have tried to find it. Being a bloke I have been more interested in the other side of the curse on the ground (Genesis 3) - painful toil, in particular back pain. I was very grateful to Rhiannon for suggesting that I wear gloves to reduce the problem of "thorns and thistles" but I've also looked at back pain from a mechanical perspective. I've concluded that it is possible to avoid serious back injury. The spine is subject to the same forces that any upright column is. Repetitive forward flexion movements, for example, put stresses on the rear part of the spine which build up over time causing injury. But we also have pain sensation which warns us when this stress is building up. Arching backwards counters this. Theologically we can say that God designed the world so that we think of him as being above us (although this is only symbolic in the sense that he has authority "over" us). So once we start to look up towards God we are countering the stresses put on the spine through hard labour. I've found that looking into the sky directly above actually halts the onset of lower back pain.
This is of course to do with the force applied on the spine by the head, which weighs more than we think. Poor posture or excessive forward bending puts the head well in front of the body's center of gravity. Looking up at the sky (like a heffalump about to fall into a trap) moves the head over the center of gravity and relieves the spinal joints.
As well as this I think I've found a mechanical cure, or at least a preventative cure, for the common cold. I'm in the testing stage, so watch this space.
If we trust that God made everything "very good" (Genesis 1) it follows that he has designed us for a long and healthy life and there may be a way in which labor and childbirth can be done safely and without the pain that most women experience. Again, being a single bloke I haven't focused on a remedy for this problem yet. But I read that the native American Indians were observed to have much less difficulty giving birth. Apparently they used to stand up and let the baby fall into a pile of leaves.... Well that apparently increases the pelvic diameter...
You seem to be straying close to an unnatural=wrong equation. I dont see the issue myself. God appears to have made it perfectly possible for 2 men to have intercourse. Just because you have an issue with the type of intercourse is no reason to discount or deny it.
If you say so. I understand how it might be possible to be attracted to the same sex, and that this leads to the need to relieve sexual tension. This is again not something I can relate to and so I haven't focused on how someone can change their sexual orientation so that their reproductive organs can function be used for that purpose (I've been more preoccupied with back pain and cold viruses). But I'm sure that this must begin with trust that God made us for a certain purpose, in this case to be fruitfly and multiple. Please don't take offence at any of this, I am as imperfect as anyone else. I just wanted to answer your point.