"Sexual intercourse or consummation is sometimes referred to as vera copula. Vera Copula consists of erection and intermission, that is, of erection and penetration by the male of the women. Full and complete penetration is an essential ingredient of ordinary and complete intercourse. The degree of s*xual satisfaction obtained by the parties is irrelevant.
Sexual satisfaction consist's of orgasm's....hence, for two different gender's there are different orgasm's.In medical point of view if you consider a women who has multiple orgasm whereas a Man has single orgasm in one particular Play of game(s*xually)
In your case where you have produced a child and marriage has crossed some time doesn't show that you are unable to perform or you have done a mental cruelity to her.
Her allegation reflect's her mental status for such s*xual plethora of game.Let her tribute that false allegations on the name of mental cruelity she will not get anything other than a Big gateway to divorce if you want to counter her claims via your petition for mental cruelity against her.
regards.