A vendor in a small town night market has a sign in Thai and Bahasa.
Thousands of foreign workers worker in Taiwan's factories, leading to the development of services for them in even the smallest towns.
By the same token, do not think Taiwanese are a bunch of naive virgins ripe for the taking.
Taiwanese females can spot a loser at a thousand paces just as well as anyone else can.
Slim, blonde-haired, blue-eyed males will have to beat the girls off with sticks.
Taiwanese women prefer tall, thin, men but a stocky guy like me never had any trouble dating here.
Whether you have trouble with parents is really between them and you and seems to be more dependent on particular circumstances than culture, though in general foreign husbands are not easily accepted.
I get along very well with my Taiwanese in-laws and did so from the start, but I know foreigners who have taken years to get accepted.
In the last century missionaries arrived during a relatively puritanical period, and happened to mesh with then-current attitudes.
Authoritarian rule has given way to personal freedom, and the field of sex is no exception.
You cannot "be Taiwanese" nor will fluency in language make you more comfortable or help you navigate better. They cost nothing, and will grease your way through society.