OP, I agree with other posters that your take on this is too simplistic. It is not a male vs female issue, IMO.
It is very common for long-term relationships to go through different sexual phases, including long periods where one or both parties may go off sex altogether. Unless a couple has agreed to a life or celibacy or partial-celibacy together, then it is reasonable for people to expect a sexually intimate element to their relationship. However, most reasonable people would accept that, in a lifelong relationship, there may be times when such intimacy is infrequent or non-existent. When my OH and I made marriage vows to each other, neither of us promised or expected to be able to make demands on the other re. sex.
As it happens, we have BOTH been through not-interested phases. Mine was the fairly typical post-natal, frequent BFing-induced lack of interest. My OH's was probably due to depression, lack of confidence, stress at work. It was difficult on the sexually interested partner during those times but we love each other and we have a true and solid friendship underpinning our romantic relationship so we were able to negotiate those difficult phases largely without hurting each other. We continued communicating. We talked about sex and why we weren't having any. We talked about our feelings. We were kind and patient with each other.
The more often you have sex, the more you want it, I have found. When a person goes through a phase of not having sex, they want it less and less. This is why telling people to 'make an effort' is not going to help. If you are the person suffering loss of libido, the thought of having sex may seem really scary and even a bit repellant, regardless of how much you love your partner. Being made to feel you 'should' be having sex or that 'everyone else is doing it' can make things feel 10 times worse. At a time when your self-esteem is already low, guilt trips from a partner (or society) are extremely unhelpful.
There is something to be said for 'making an effort' but not in the way I think you mean. Efforts that people can make to try to improve their sex drive might include lifestyle changes e.g. getting regular exercise, looking after their mental health, trying to decrease stress in their lives where possible. If the problem goes on for a long time then those efforts may extend to seeing a GP to discuss libido or perhaps exploring relationship counselling.
I know that my OH and I have been prepared to make those kinds of efforts in our relationship to get intimacy back on track when it is lacking. What neither of us has been prepared to do is to just jump in the sack when we don't want to. Likewise, neither of us would expect that from the other.
At present, neither of us has a problem with libido 