In Judaism, however, since the sin of Adam and Eve was not a sexual sin, the stigma of sex as being a illicit affair has not taken hold. Classical Judaism accepts the sin of Adam and Eve as being a sin of disobeying a divine command, a command to watch the fruits of the tree of knowledge and not to partake of them. It was only after Adam and Eve were banished from the Garden of Eden that we see that they we embarrassed from their nakedness. In addition to the above, we also note that one of the first commandments that G-d gave to Adam was to be fruitful and multiply. It must be obvious to all that if G-d Himself, commanded Adam to procreate, there was no evil attached to the act.
Jewish sources reject the concept that sex is an intrinsically evil act.
Judaism regards sex in a manner similar to other bodily functions such as eating and drinking. Eating and drinking can bring great ruination to man if done improperly. It requires little proof to note that obesity and alcoholism are outcomes of overindulgence and negative. Yet, eating and drinking are obviously important and beneficial functions of the body. Going further, eating and drinking compromise an arena of holiness that is available to the Jew.