I never knew people found it taboo to use condoms in marriage. There are many reason married people would use condoms.
Birth Control keep in mind:
-some people reacts poorly to hormonal birth control, hence condoms work better for them
-some people have moral/ethical objection to hormonal birth control but not condoms.
-some have easier access to condom then they do other forms of birth control.
-Some find it easier to remember to put a condom on each time then remember to take a pill every day.
-Some have them as a backup in case their partner forgot to take the pill.
-Some people are very cautious about unplanned pregnancy and like having both a barrier and a hormonal form of birth control in place.
STD prevention keep in mind:
-Consensual non-monogamy (married doesn’t equal monogamy)
-People with known STD get married too, some chose to have sex and use condoms to minimize the risk of transmitting it to their partners.
Some people don’t like the feeling of semen inside them and would prefer easy clean up.
Using them on toys.
For anal due to concerns about the “mess”
And I could probably think of more but ya plenty of reason for married people to use condoms.