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Furthermore, thecandidates were asked whether sexual activity occurred with a familiar partner, and had to
indicate the intensity of the sexual activity by intuitively placing a mark along a scale of
50mm, where “0” represented low intensity and “50” indicated very intensive sexual
activity. As environmental parameters, weekends and full moon intervals were coded post-
hoc by the authors. Daily behavioural events, as well as the environmental parameters were
then analyzed for their co-occurrence with T and P peaks.
Because we had to deal with a large number of variables
sampled repeatedly over a 90-day period we were restricted to calculate with derived
measures of individual variability, such as individual mean hormone levels, the individual
maximum amplitude observed, or the individual coefficient of variation throughout all
days sampled. Using these measures one may conclude about the hormonal status of some
general demographic and life history prototypes.
rom the numerous detected non-random time-patterns per individual the
“frequency of occurrence” (Noccurrences divided by the total duration of the sampling
period) of each male’s most complex pattern within the 90 days was derived. The
frequency of occurrence was compared between those 22 candidates in whom THEME
detected patterns involving both, hormonal and behavioural variables.
Because this interval echoes the average length of the female
cycle, we expected to find this interaction in paired rather than in unpaired men.
Surprisingly, the observed variation of male monthly time-patterns could not be explained
by being paired or not (Fig. 5.5A). However, as already observed for the interaction with
sexual activity, also the T peaks interacting with monthly intervals occurred significantly
more frequent in “wannabe father” as compared to those men who had no partner or did
not want to have children with their current partner (Figure 5.5C). There was no difference
between the occurrences of monthly T patterns of non-fathers or fathers and also not due to
any of the other investigated life history parameters.
Time-patterns involving P peaks at monthly intervals were detected in 15 of the 27
candidates, with a range from one to 22 pattern combinations per individual. As with the T
and monthly interval patterns, also the P and monthly intervals patterns were not simply
due to being paired or not (Figure 5.5B), but were clearly more frequent among wannabe
fathers than in singles or those men who did not wish to have children with their current
partner (Figure 5.5D). None of the other investigated life history parameters had an effect
on the occurrence of P peaks at monthly intervals.
This does not
point at a male cycle in any parameter, but rather at the males’ hormonal responsiveness to
sexual activities. With regard to a potential male responsiveness to the 28-days interval of
the female’s menstrual cycle, one would expect to observe such response patterns in paired
men rather than in singletons.