Sentence examples for copulation have been from inspiring English sources

Although functional explanations for female engagement in extra-pair copulation have been studied extensively in birds, little is known about how extra-pair paternity is linked to other fundamental aspects of avian reproduction.

The first act of copulation has been traced back to ancient animals that were endowed with such cumbersome sexual organs they had to mate side by side.

The first act of copulation has been traced back to ancient animals that were endowed with such cumbersome sexual organs they had to mate side by side, 'square-dance style', with a bony, L-shaped male organ and female 'cheese-grater' genitals.

When successful, copulation has been observed to last from 15 minutes to as long as two and a half hours.

Females that did eventually remate did so faster, the sooner their first copulation had been interrupted (logistic regression, Wald = 11.8, P = 0.001, with 63% correctly classified classes, Figure 5).

Latency to remating was significantly shorter when the first copulation had been interrupted after 60 s than when the first copulation was terminated naturally (mean difference 68 ± 20 min, P = 0.016) or interrupted after 150 s (60 ± 19 min, P = 0.035).

As much as 30% extra-pair copulations have been noted.

Successful copulations occurred in 110 out of 614 (17.9%) trials, and in 57 trials (9.3%) copulations had been preceded by female solicitation (tail quivering).

A similarly high proportion of failed copulations has been reported in other insects that transfer sperm via spermatophores; for example, in a noctuid moth species 20% of copulations between virgins failed to transfer any sperm to the female's storage organs [42].

Most Christian commentators speculated that their copulation would have been brief — perhaps no more than the apes' six seconds — and intended exclusively for reproduction.

Prolonged copulation durations have been found to act directly as mate guarding (reviewed in [ 26]).