If your partner has difficulty having orgasms but responds to manual stimulation, then you might want to do that before beginning intercourse. It is very common, and as long as the two of you enjoy it, then it is a good thing. If one of you can only make love with porno in the background, then you are heading into problems. It depends on the type of porn as well. I advise you get pornos with more sensuality in it because a lot of pornos today are really bad.
Women are more visually pleasing.
I say yes, but she keeps asking for it. My advice is you need to decide if you are enjoying this or if you are not. It is odd how humans can't live together effectively but can have intercourse effectively. She may be mourning the loss of the relationship and the fact that the only venue of happiness with you is sexual. The experience of having sex with your ex spouse is amazingly common.