And you can ‘excite’ all you want - as long as you do something that is just between the two of you and focuses on the two of you exclusively - instead of bringing in outside stimuli from third parties, which necessarily implies that the two of you really aren’t enough for each other.
There’s nothing wrong with lingerie, whipped cream, a nice slow massage - all incredibly enjoyable. There’s nothing wrong with even making your OWN private ‘movie’ or writing your own poetry celebrating your love for each other!
It’s when you bring outsiders into the bedroom - THEIR poetry, THEIR sex scenes in THEIR movies - that it becomes wrong. You can’t escape the underlying message in such situations that the two people in the room simply don’t feel like they have anything to offer themselves.
Look, I’ve been in sexual relationships and never had problems with just the two of us alone, ESPECIALLY after we had not had sex for a while! If movies and other erotica had entered the picture I could never again have felt sexy, never again felt that I was good enough. Not if my partner (or I, for that matter) needed outside help.