I say buildup. For women sex is 50/50 mental physical alot of time, esp when you are with the same lover for a long time. Guys are like 99% phycisal, audible, visual... So after the act itself is no longer a challenge but an expectation, buildup can be one of the best parts... Leaving dirty messages (text, phone, emails), thinking about doing it in a spontaneous place and time (then doing it when you get there), discussing an act in great detail.. and then doing it all later... Having those engines going makes getting and being these twice as fun.
Of course, the rest is all good too.
