Yessss

Definitely inside but I don't mind swallowing

While protective barriers may differ, I generally prefer inside. Pulling out kills the rhythm and energy built up for me, and is less enjoyable. I love coming together, and then laying there together, a big sweaty mess, still all tangled up.  

Obviously with P4P, the guy gets to do what feels best for him though

There are some studies out there that say that it even helps with depression/mood in women.

Because she hates CIM or COF and knows one of those is next.  

According to science, there are anti-depressant effects resulting from the chemical reaction of ejaculate lining the inside of the vagina. More to the point, there is a natural climax that occurs when a man finishes inside that involves a few, final deeper strokes that keep a natural rhythm during the sex without interruption, allowing the woman to ride the wave of sensation to the end instead of getting thrown off the proverbial surf board before the curl of the wave dies down.  

Pulling out is an abrupt, almost rude withdrawal that has the feeling of your vagina being used as a kleenex more than part of a sharing experience where you are joined, even if temporarily. I realize it is the fashion now to pull out and to spray on the woman like an out of control 12 year old that can't control his bodily functions or some lower evolved animal that must mark his territory with body fluids to establish his authority in the environment but beyond that, it is a largely empty act that makes it clear that the sex was nothing more than complicated masturbation using another person's body rather than an act of sharing erotic joy or sexual love. YMMV, of course depending on how much bad porn you watch and which porn era you came of age during.

And finally, during ejaculation there is a sensation of swelling and throbbing as the vagina squeezes down on the erection during her own orgasmic spasms which is not comparable to anything else inside her when it happens, regardless of size, length, or shape. It is a lovely soft ending to a previously (and hopefully) intense and turbulent flight through the erotic skies.

Hope this helps explain.