Nearly all ancient peoples worshiped sex in some form and ritual, and not the lowest people but the highest expressed their worship most completely [… - Will Durant

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Nearly all ancient peoples worshiped sex in some form and ritual, and not the lowest people but the highest expressed their worship most completely [...]. The sexual character and functions of primitive deities were held in high regard, not through any obscenity of mind, but through a passion for fertility in women and in the earth. Certain animals, like the bull and the snake, were worshiped as apparently possessing or symbolizing in a high degree the divine power of reproduction.
The snake in the story of Eden is doubtless a phallic symbol, representing sex as the origin of evil, suggesting sexual awakening as the beginning of the knowledge of good and evil, and perhaps insinuating a certain proverbial connection between mental innocence and bliss.