Is the premarital checkup really that scary?

A friend's son was planning to get married on May Day, but the girl's conditions included a betrothal gift of 268,000 yuan, an engagement banquet, a change of address fee, a cash gift, and five gold items plus a diamond. Even the house that the friend bought outright was required to have the girl's name added by her parents, and the friend agreed to all of it.

However, the friend and his wife only requested one thing: that both children must undergo a premarital checkup. But the girl refused, saying it was a sign of distrust towards her. The boy insisted on the premarital checkup, but the girl was adamant against it. In the end, the girl was willing to break up rather than go for the checkup, and they couldn't come to an agreement. Yesterday, they broke up, and the engagement was also called off.

I just wonder, is the premarital checkup really that scary?