For me sex is important is certain relationship.

because diff ppl has diff thinking, especially in a relationship man and woman always has diff thinking.
Man may think sex can make their feeling better but woman may think sex can make their relationship go worst.

but in ts case,
the man thirsty for sex quite a lot, while the woman afraid or not use to it after she tred it.
So now both also require partner understanding of,
the man hope the woman more understand his "physical need",
the woman hope the man understand her mentally scariness.

Its either asking the man to think some other thing which is important in a relationship other than sex. And also respect his partner and not treating her just a sex toy/slave;
or ask the woman to get use it as in the future they might need it alot, and sex is one of the way to make husband and wife better. If she still afraid of something, she really need her partner to comfort her for that, not other friend