Hmm

i'd say she does need it.
because it looks like she doesn't understand her own body and she can't guide him if she doesn't know herself....
on their first time she said the fingers were "interesting" and iit made it sound like she never touched herself

tbh they both need to research, simply put i dont get with they made her the only one trying so hard as if there is something she needs to "fix" about herself... that's why the ML clearly needs to do research too like you said because he thinks its a problem she has