He wrote Helen that a young writer needs desperately to live with someone and he...

He wrote Helen that a young writer needs desperately to live with someone and he had decided that he wanted to live with her; even marry her, he offered, because sex was simply necessary but it took too much of one's time if one had to be constantly planning how one was going to get it. Therefore, Garp reasoned, it is better to live with it!
Helen revised several letters before she finally sent him one that said he could, so to speak, go stick it in his ear. Did he think she was going through college so rigorously so that she could provide him with sex that was not even necessary to plan?