Sexual Selection

There is a logic to sexual development and sexual selection.

Sexual Selectivity
Humans can be very specific in who they select to mate with.
They can know who is their partner; and they can be confident that the sperm the partner provides is indeed received.
This is because humans make use of sexual intercourse in the form of sexual receptivity and penetration.
The sexual aparatus of humans - vagina ("sheath") and penis - has developed as part of a extensive pattern in nature:

Sexual Exchange
The basis of sexiality can be found already in microbes.
Bacteria exchange a protein strand, which has the information of the differences in context and conditions that they lived through.
(Lynn Margulis points out that our existence is based on the symbiosis of microbes.)
It is through this information exchange that we learn to live and survive in context/conditions that we ourselves dit not live through.

Sexual Echange Development
Exchange of this encoded information takes place in various forms:

• Plants spawn by the wind, and pollinate via insects
• Fish spawn in a cloud in the water, which the male can swim through to add sperm
• Birds (and other animals) use cloacal junction contact: one duct pressed onto another
• Mammals use insertion of a probe (penis) into a receptor (sheath) for more secure coupling

Partner Selection
This development shows that there is a greater selectivity for the DNA that is used for mating.
Humans can be very precise and selective in the choice of the DNA to be used in conceiving offspring.
This implies that the woman can be very selective about the man she wishes to mate with, & v.v..
In many cultures this biological basis is not part of their cultural social psychology in regulation of mating...

Our biology indicates that the ability to be specific about the choice of sperm DNA for fertilising the egg DNA is important.
This blog is set up to learn to appreciate the implications.