The full article refers to a number of studies on human
smell capabilities.
https://www.sciencealert.com/experiments-show-women-can-sniff-out-single-and-married-men
The eyes are often said to be the window to someone's
soul, but the nose could be a backdoor to their
bedroom. Experiments have found heterosexual women
can actually smell which suitors are available and
which are taken.
In recent years, the science of human scent has been
sniffing up a storm in the lab, and recent results
suggest that people who like to take deep whiffs of
another's natural fragrance are likely to be more
sexually motivated overall.
Straight men also seem to be more attracted to a
woman's scent when their crush is at the most
fertile point in her menstrual cycle, or when a
woman is sexually aroused. Exposure to these
pheromones can even trigger men to drink more on
a night out.
Conversely, when women are ovulating, studies have
found they are more attracted to masculine-looking
males. Experiments also suggest that men's
testosterone levels can subtly fluctuate depending
on whether men they're single or in a committed
relationship.
...
https://www.frontiersin.org/articles/10.3389/fpsyg.2019.00261/full
Previous research indicates human body odor (BO) can
signal kinship, sickness and genetic compatibility.
Based on research indicating single males have higher
testosterone levels than partnered males and that
higher testosterone levels are associated with
stronger smelling BO, the current study aimed to
determine if, by extension of previous findings,
single males’ BO smells stronger than partnered males’
BO. Eighty-two heterosexual women aged 18–35 years
rated the BO and faces of six different males also
aged 18–35 years. Consistent with the hypothesis,
single men’s BO smelled stronger than partnered
men’s BO and single men’s faces were rated as more
masculine than partnered men’s faces. The possible
advantages of females being able to identify single
males are addressed in the Discussion.
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