Is adultery really immoral? The act itself is mostly legal, so why can't it be mostly moral? I'm a male bachelor, so I can only argue from my point of view. Adultery is a simple biological urge that manifests itself onto two persons, one or both of whom are married. Marriage today is becoming more and more a simple legal contract, routinely terminated and routinely redefined by judges and plebiscites. The ease with which marriages can be terminated either on paper or in practice is just a reflection of the fact that people often change in their feelings towards one another--love fades within marriage and sometimes erupts outside marriage. Making it with a married woman can be very thrilling and the same woman would not be equally exciting if she were single; the supposedly unavailable is always more desirable than the easily attainable. Married women accept advances because their husbands can no longer give them excitement, romance or adventure, so why not a net utilitarian gain for two people, and no...

Because, for every X, there is a philosophy of X, it should come as no surprise that a well-known philosopher has written a book on this subject! I refer you to Richard Taylor's Having Love Affairs (Buffalo: Prometheus Books, 1982), isbn 0-87975-186-X, http://www.amazon.com/Having-Love-Affairs-Richard-Taylor/dp/087975186X

I'm a scientist. The results of my research may generate technologies that could potentially be used in both and offensive and defensive military applications. These same technologies could potentially help people as well. Here are two examples: (1) My work could potentially create odor-sensing devices to target "enemies" and blow them up, but the same work could aid land-mine detection and removal. (2) My work could help build warrior robots, but it could also help build better prosthetics for amputees. For any given project, I have to decide which agency(ies) my lab will take money from. I do not want to decide based on the name of the agency alone: DARPA has funded projects that helped amputees and killed no one, while I would bet (but do not know for sure) that some work sponsored by the NSF has ultimately been used in military operations. So I'd like to base my decision on something more than the agency acronym. How can I start to get my head around this? What sorts of questions should I...

I am happy to read Miriam's and Thomas's replies to this question, because it is one that I somewhat unexpectedly faced when I switched from being a professional philosopher to being a professional computer scientist (albeit one with a highly philosophical bent!). The first time the issue came to light was when I gave a talk to computer and cognitive scientists at the University of Texas at Austin about 20 years ago. One of my hosts was Benjamin Kuipers , a leading researcher in artificial intelligence, who had done groundbreaking work, as a grad student supported by military funding, on "way finding": How to program computers to give and to follow geographic directions. He told me that after he got his Ph.D., he realized that, as a practicing Quaker, he could not in good conscience continue to take military funding, especially if that meant that he would have to fire grad students or postdocs who would be working under his direction if the military asked him to do something against his beliefs...