I know first-time sex scenes between adults do exist in the literature, but are there any stories with awkward first-time moments? By "adults", I am referring to the mid-to-late 20s or early 30s age group or married couples regardless of actual age (may be as young as 16 years old).
This question is similar to the other question about researching something you don't know, and that something is sex.
The sex scene may be relevant to the story, because it reveals how naïve the protagonist is when it comes to sexual intercourse. Both partners have no prior sexual experience. And the author, who also has no sexual experience, attempts to write such a scenario.
Alternatively, perhaps another way around it is to write the aftermath. That is, the failed sex attempt does not result in pregnancy. The couple tries again and again. One year passes, and the female is still not pregnant.
In a case like this, I don't think conducting an interview will work. First of all, how would one find the target population (married couples with both partners not having prior sexual experience)? Second of all, would they even be willing to share their first-time sexual experience?