Positive - increased variation in a species
Negative - energetically costly, must find sexual mates, need more complex reproductive systems
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A well-known negative aspect is that it is basically necessary to kill one human (by taking out the genetic material from a fertilized egg) to make a clone of another. However, this only applies to current technology; and it is conceivable that other methods are found. A long-term concern is the risk of reducing genetic variety - it is precisely because of the advantage of maintaining genetic variety that sexual reproduction is so successful (most species use it). I believe those disadvantage far outweigh any perceived advantage; but perhaps someone else can give you more information about the positive aspects.
Sexual Behavior and Sexual Identity.
Sexual relations outside of marriage such as sexual intercourse, and similar acts.
Yes. Both men and women continue having sexual desires even at an advanced age. The frequency of sexual intercourse tends to be less when you are old, though.
It stands for Sexual Disease. Normally, you will see STD which stands for Sexually Transmitted Disease.