Not so.
Ears were designed for listening.
Feet for walking.
Mouths for making noise.
All your examples are fine.
But you're using a double standard. Strictly biologically speaking, mouths are for ingestion and communication. Singing is for neither -- it's for pleasure.
You seem to be fine with mouths being used for non-ingestive purposes (such as for pleasure) -- why, then, is using reproductive organs for non-reproductive purposes (such as for pleasure) somehow different?
Now, I'm not saying that sex is only for pleasure. Sex is also a communicative act -- it can be an expression of love. That seems to me to be a completely natural "use" of sexual organs -- just as natural as using a mouth to sing rather than eat.
Do you see what I'm trying to say now? You're using a weird, subjective double standard: why do you say that using penises and vaginas for pleasure is outside the "order," but using a mouth for pleasure isn't?
As many others have pointed out several times, you seem to simply be defining what YOU agree with as "within the order" and what YOU disagree with as "outside the order," but without any objective explanation that isn't rife with double standards or undefined half-concepts.
nnmartin said:
It is also fine for a woman to love another woman.
A man can also love another man.
for example, I love my brother.
You know what I meant. Love-
making between women, or between men. Consenting, adult, mature women having sex with women or men with men.