Usually when they debate it in terms of Practical and Moral, it's talking about whether a society/state should regulate or prohibit it. Practically, does the state have a role in it?: There are STDs, pregnancies, safety-issues for the hooker vs. it's a huge industry/people are going to do it anyway/why not regulate it and just make it safer/etc. The moral issues are more like: God opposes it/certain social groups opposite it on ethical grounds (Churchgoers since God is against it, feminists since it objectifies women, etc) vs. it's no one's business what someone else does with their body, people are just like animals and free, etc...