He or she is not infertile. They have normal sex hormones but just they don't find it interesting.

To clarify,

For instance, compared to a man (who is not this) who'd stare at a blonde in a swimsuit, this guy will simply turn his face.

Any term (including slang) would work.

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    two downvotes to a question asking for the term! Learning a lot here! – Maulik V Aug 25 '14 at 6:26
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    +1 from me, I guess some people are not only allergic to anything that might have to do with sex, they are also too yellow to admit they even looked at such a vile thing... – oerkelens Aug 25 '14 at 6:32
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    @Laure — I'll give credit when I know who I am giving it to :) Anonymous downvoting — unless there is a very obvious reason like spam — does not inspire me to give much credit... – oerkelens Aug 25 '14 at 6:55
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    @DamkerngT. A relationship can be platonic (ie without sexual intercourse) which doesn't prevent the persons involved from feeling physical attraction/desire for each other. – None Aug 25 '14 at 7:01
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    @MaulikV — sage may be different, but how about parsley, rosemary and tyme? – oerkelens Aug 25 '14 at 7:12

Such a person would be asexual or nonsexual, their condition would be called asexuality or nonsexuality:

Asexuality (or nonsexuality) is the lack of sexual attraction to anyone, or low or absent interest in sexual activity.

There is also a website about it (it seems google takes its definition from there), but I cannot reach it to check from behind my current firewall. If google does take it from there, this page says:

An asexual is someone who does not experience sexual attraction. Unlike celibacy, which people choose, asexuality is an intrinsic part of who we are. There is considerable diversity among the asexual community; each asexual person experiences things like relationships, attraction, and arousal somewhat differently.

  • +1 for non-sexual. asexual took me to my school days and biology was my favorite subject! :) – Maulik V Aug 25 '14 at 6:40
  • do you know any slang for that? – Maulik V Aug 25 '14 at 6:42
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    In a usually pejorative sense, and especially applied to women, the word frigid (sometimes just cold) is used. However, that is usually not related to the actual asexuality, and it is often said of a woman who simply is not interested in sex with the person who calls her frigid. Wiki explains what frigid actually means. – oerkelens Aug 25 '14 at 6:53
  • @MaulikV As you already know, a lot of terms translate differently in English than in Science subjects. This definitely creates a confusion for those students but still doesn't affect the usability of such words. – JuliandotNut Aug 25 '14 at 6:58
  • @oerkelens went through that. good option. – Maulik V Aug 25 '14 at 7:04

The term "frigid" means "uninterested in sex". I just checked dictionary definitions and they don't say this, but it seems to me that I have only heard this term used to describe a woman who is uninterested in sex, not a man.

A man who is incapable of having sex is called "impotent", but I don't think that's quite what you're looking for. That's "can't", not "doesn't want to".

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    And I think a guy who's impotent can still have sex, they just can't reproduce. – Jim Aug 26 '14 at 4:39
  • @Jim Arent you confusing impotent with infertile? Of course, sex is more than penetration, but impotence is usually used to describe the inability to achieve a (full) erection. – oerkelens Jul 15 '15 at 9:46
  • To person who edited my post to say that the term frigid is "sexist": I'd say maybe, but not necessarily. If you think so, make a comment. Please don't put your words in my mouth. – Jay Jul 15 '15 at 13:28
  • @Jim It can actually mean either or (unable to perform the deed, or unable to reproduce when the deed is performed) according to the dictionary I read. – Crazy Eyes Jul 15 '15 at 14:53
  • @crazyeyes thefreedictionary.com/impotent gives definitions taken from 3 dictionaries. All 3 include inability to have sex. 1 of the three gives an alternate meaning of "sterile". So I think "can't do it" is the more common meaning, thought "sterile" is a possible alternative. – Jay Jul 16 '15 at 13:15

Depending on the person's reasons for not being interested in sex, one or more of the following terms might apply:

  • Chaste -- Many people choose to only be interested in sex with their spouse(s).
  • Pious -- Chastity is a virtue in many religions. Jesus taught that looking at a woman (other than one's wife) lustfully is a serious sin.
  • Celibate -- Some people choose not to be interested in sex.
  • Oblivious -- Some people don't notice people (or aspects of people) that others consider sexually attractive.
  • Aspie -- People with Asperger's syndrome (or related syndromes) do not react "normally" to many stimuli.
  • Polite -- In many cultures, it is not polite to stare at a woman, even if she is "a blonde in a swimsuit".

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