Again like the incest offenders vs. children, a large proportion of the married incest offenders vs. minors (79 per cent, second in rank-order) had extramarital coitus. In this instance the percentage has been increased by two factors. First, these offenders are the second oldest group in our sample, the median age at reporting being forty-one years; hence they had had more time in which to have engaged in extramarital activity. Secondly, in six cases this was the offense for which they were convicted. Despite these qualifications one can still say that the incest offenders vs. minors were prone to have extramarital coitus since some groups of similar or greater age (e.g., the heterosexual offenders vs. children and the incest offenders vs. adults) do not display as high percentages, and some of the offenses for which they were convicted also constituted their extramarital experience. Their age-specific incidence figures for extramarital coitus are generally moderate insofar as such coitus is with companions: roughly one third to two fifths were thus involved between ages twenty-one to forty-five except for an unexpected 47 per cent figure in age-period 31-35, when the incest activity became chronologically possible for most of them.
Their incidence of extramarital coitus with prostitutes is somewhat different. Beginning with moderate proportions, these offenders rise to third rank in age-period 36-40 with one fifth of them having such coitus, and remain in the same rank in the next age-period with over one quarter involved. The frequency of extramarital coitus among those with this activity is always somewhat low—a characteristic of incest offenders. However, a larger proportion of this coitus than is Usual was with prostitutes. The average individual had extramarital coitus with companions with frequencies of from 0.10 to 0.08 per week, while with prostitutes it was 0.06—a large proportion similar to that of the control group. However, the proportion of total sexual outlet constituted by extramarital coitus with either companions or prostitutes is, in general, moderate. Calculation of the average number of extramarital coital partners is confused by the fact mentioned above, that the incest in some cases constituted the extramarital coitus, but even so the incest offenders vs. minors had an average number of extramarital partners (nearly six, the same number as the incest offenders vs. adults had).
There were too few separated, divorced, and widowed individuals to permit calculation of postmarital statistics.
*143\161\2*
