Dr. Justin Lehmiller gave his blog post the title Some People’s Brains May Be “Wired” To Seek More Sex. He says:

What these results tell us is that people’s brains seem to respond to sexual imagery in very different ways. For some people (i.e., those with more partners), the brain appears to be highly sensitive to all sexual cues, whether they are mild or intense. However, for others (i.e., those with fewer partners), the threshold for sexual arousal is set much higher, meaning that it takes a strong cue to elicit a strong response. Because these differences in brain sensitivity were related to previous number of sex partners, these findings raise the provocative possibility that the way our brains are “wired” to respond to sexual cues could potentially be a key factor in explaining why some people pursue more sexual partners than others.

But I am siding with the skeptics in the comments. Especially SandraL who said:

The conclusions being drawn here seem to be making unproven assumptions about correlation and causality. Are people more likely to seek out sexual experiences because they’re more stimulated by explicit sexuality, or are people more stimulated by explicit sexual images because their brains have been primed by frequent sexual experiences in the past year?

I know there has been a fair amount of desensitization to my sexual interest over the years. I have seen and participated in so many group sex situations that it seems pretty ordinary and natural to me. This was certainly not the case when I was in my late teens.

I think more research on this topic is needed.