The first simple "his and hers" DIY fertility tests are being sold over the internet for £31.99.
Scottish company Med- Direct is also offering a men-only package at £19.99, claiming that a new era is on its way with men taking far more responsibility for their part in procreation.
And very soon other researchers hope to offer men another self-testing kit, for chlamydia, a disease that causes few problems for men but can lead to infertility, ectopic pregnancy and even death for women.
The women's part of the fertility kits is based on a long- established technique, using test sticks to detect the surge in urine of the hormone responsible for ovulation, an indication that ovulation will occur within the next 24 to 36 hours.
But the test for men is new, involving them testing their sperm with reagents twice within a week to assess their sperm count.
Med-Direct concedes it cannot differentiate between dead and motile sperm.
However, a competitor, to be sold next year by a London firm Genosis, will be able to do so. Its women's kit will also be more advanced, testing for the follicle stimulating hormone, which will be an indicator of the store of a woman's eggs in their ovaries.
Robert Barlow, managing director of Med-Direct, accepted his product could lead to "a tiny proportion of men having a positive result but with predominantly dead sperm". But for the majority "it will be an entirely valid first-line screening".
He added: "People want to take more control of their lives. They are more informed and educated but we have always left men out of the loop in the fertility game."
The his and her kits, known as BabyStart, were aimed at couples, while the men-only product could help individuals monitor their condition. Sperm counts worldwide are falling and bodybuilders and those who worked in some industrial processes might be at greater risk of fertility problems.
Dr Barlow said: "People buying from us fall into all sorts of categories. Many couples wish to conceive quickly and confidently to fit in with their career aspirations, but many are in their late-20s or mid- to late-30s and have put off having a family because of career pressures."
About 600 British men have already tried the fertility kit but it has not been widely advertised. Although the company would consider over-the-counter sales , the internet is thought more discreet.
Dr Barlow said he could not envisage British men going into a chemist's shop and asking for a testing kit, especially from young women.
Ian Banks, president of the Men's Health Forum, welcomed the move towards self-testing for men.
