The answer for this problem lies in the scientific and social roles of males and females and in the way that sex toys may replace the role of men in those relationships.
Simplifying the subject significantly, progress has led to many species having males and females for sexual reproduction causing the sharing and diversity of the gentic pool. However the existence of two 'types' of a species has also helped the development of specialisations/roles for your males and females.
In animals the key natural big difference is the fact that the male provides sperm and the feminine provides eggs. After fertilisation the girl has the role of giving milk to the offspring after birth and seeking after the embryo in the uterus (womb).
With this simple view the man gives just the sperm and a of the gene pool. Nonetheless it would generally be too expensive in sources (in evolutionary terms) for that to become the only part of men, and so social responsibilities have changed. Guys frequently care for their spouse and offspring by helping to provide food, safety and a 'house.'
With people, changes in much of the world signify a number of these social roles could be given by women alone and some women claim the world will be better off without men. If you know anything at all, you will perhaps choose to compare about anal sex toys for men. Moreover biological improvements will make men unnecessary due to their biological role of fertilisation of the eggs.
The last remaining need for men may possibly become among providing entertainment and sexual pleasure for women - but perhaps women can do without men for sex!
There's a growing move towards women looking at other women for sexual relationships; women are using sex toys more often as penis substitutes and many women discover they get greater sexual pleasure from sex toys (as measured by energy, frequency and reliability of climax) than they do from sex with men.
Some women work out the male role by using a strap-on harness and many dildos represent a man's penis. On the other hand many women would rather exclude the male phallic image from their sexual play and they choose a vibrator or dildo that is perhaps not phallic and may possibly indeed possess a distinctly female style as does the Natural Contours Ultime vibrator.
This simple picture, though perhaps frightening for men, is ra