It sounds contradictory, but straight men apparently enjoy looking at penises almost as much as they do vaginas. As part of their research for their book A Billion Wicked Thoughts, Sai Gaddam and Ogi Ogas ranked Internet searches in terms of popularity from their NSA-sized database. Their results showed that search terms for female genitalia are only just more popular than search terms for male genitalia, by a factor so small there’s practically zero difference.
Other research the pair did seems to bear this out, too an analysis of the 40,000 or so most popular porn sites in the world found that over 1,000 were heterosexual sites with an emphasis on comically large penises, while a porn aggregator site that listed the top 100 sexual images on the web by rating included 21 that were purely close-ups of male genitals. The inference is that many straight men like nothing more than to stare at another guy’s junk