Who knew a nuclear power plant could be sexy? Nicely written. ;)
It's true, foreplay can actually be considered anything that leads up to sex, so when you are out and about, or doing other things with your partner, caressing them, kissing, whispering in their ear what you plan to do with them later etc - that is all foreplay. Foreplay basically starts as soon as sex ends. It's everything in between sex.
My partner when we were together (we're long distance right now) would kiss my hand when we were walking out together, would kiss my ear when we were standing waiting to cross the road, would make out with me on public transport, caress me when we are watching a movie etc. And I would do similar back. All of that leads to an overwhelming feeling of being desired and desirable, and that makes you feel uninhibited sexually. Because I think a lot of women worry about being too sexual, about fully letting go and being as sexual as they want to be, and so having a lover who makes it very clear that you are a glorious goddess in his eyes, the epitome of desirability, makes you feel free and able to initiate and also let go during sex. Because the biggest inhibitor of enjoying yourself during sex is insecurity or anxiety.
Likewise, all of that everyday teasing, helps get the mind racing and imagining what sex will be like later that day, which makes you ready for it, indeed beg for it sometimes. ;)
And mutual teasing/naughty texts/whispers/kissing/touching that is not exactly sexual but holds the promise of sexuality, it helps the giver as well to focus on how attracted they are to their partner.
I intend to ALWAYS be that kind of partner, and even long distance my partner is always telling me how beautiful and sexy he finds me, and we do phone sex and I write erotica and sexy poems for him. So when we do finally reunite the sparks will definitely explode! :)