Manila is the most popular area for expats in the Philippines. Be aware that Mindanao in the south of the Philippines is considered a dangerous place for foreigners and should be completely avoided.
Water in the Philippines is not suitable for drinking, but if you are staying in the city, particularly in an expat area, you should have access to running water and electricity. You can read more on the Expat Arrivals Accommodation in Philippines page.
Most expats move to the Philippines as part of a transfer within an international company as it's quite difficult to get work independently as a foreigner in the Philippines. The Working in the Philippines page has more info.
The age of consent in the Philippines is 12. As the culture there can be quite conservative I would say it is possible that she could face some discrimination, but it's difficult to say for sure. You can read more info on the Expat Arrivals Culture Shock in the Philippines page.
I hope this answers some of your questions. Best of luck.
Most expats do go to Manila, so that's why much of the information for prospective expats is focused on Manila. What area(s) were you thinking of? If you can give me specifics then it will be much easier to give you the information you're looking for as the Philippines is quite large geographically (there are over 100 cities).
It is very unlikely that you will find someone willing to hire employees from outside of the Philippines because that would require the employer to prove that it was not possible for a Philippine national to fill that role. Most employers are not willing to do this because it is a lot of paperwork and in most cases, it is indeed possible to fill the position with a Philippine national unless the job is extremely specialised. What industry do you work in?If I have that information I can give you information about the situation there with regards to your line of work.
There is only one age of consent according to law, and that age is 12. The only other law which may be of interest regarding age and legal sexual activity is that sex with anyone under 18 by using force, threat or intimidation is illegal - but if there is no use of force, threat, or intimidation, it is entirely legally permissible for someone between the ages of 12 and 18 to consent to sexual activity. That said, using force, threat, or intimidation to have sex with someone over the age of 18 is illegal, too, as it is considered rape.
As I said, the culture in the Philippines is quite conservative. Could you be more specific about what kind of discrimination it is that you're concerned about? I will say though that, sadly, there are very few, if any, places in the world where there is no kind of discrimination whatsoever.
Apart from Manila, here are some other places you might consider doing further research on as places to live: Quezon City, Puerto Princesa, Cebu City, Iloilo, Davao City, Baguio City, Makati City, and Roxas City.
Note that some of these areas are in the province of Metro Manila - this is not the same as the city of Manila which I referred to earlier (although Manila is of course part of Metro Manila).
Approximately 90% of the population in the Philippines are Christians with the vast majority being Roman Catholic. Whether you are Catholic or not you would still be in the most common religion in the country broadly speaking so I think you'd be fine there. Also, people in the Philippines do have a reputation for being very friendly so that helps too. As a black man, you may get a few stares every now and again simply because Philippine-born nationals are rarely black (or white for that matter) but I wouldn't think you'd face major problems. I'd imagine this effect would also be less pronounced in places where the expat community is large.
It would be a struggle to obtain citizenship, I think, as you would have to reside in the country for 10 years (or 5 years if you marry a Filipina) and meet a number of other requirements as outlined here.
You may find this helpful in guiding your job search. Another option would be to start your own business in the Philippines, which is a common route taken by expats there, especially if they can't find a job. The Expat Arrivals Doing Business in Philippines page has more information on the business climate there.
As I understand it, anyone aged 12 and up can legally consent to sex. Up to age 18, there's a law which seems to be aimed at making sure adults in power or in positions of influence don't use that position to "seduce" the under-18 whether by threat, intimidation, etc. Here's the exact wording of this law: "the age of sexual consent is 12 for all, but contacts with minors (under 18) are an offence, if the minor consents to the act for money, gain or any other remuneration or as the result of an influence of any adult person." The age of legal majority is 18+.