[annalex]

there is plenty that tells us that Mary and Joseph had sex and had other children

Plenty where? You have not shown us any scripture to that effect.

[Cronos]

there is plenty that tells us that Mary and Joseph had sex and had other children

FC -- you seem to rely on pure conjecture. However, I guess that the error lies more which your teachers/pastors who propagate these gross errors, than with you.