Sexless
It's not abortions, abortion rate is below world average:
https://worldpopulationreview.com/country-rankings/abortion-rates-by-country
Abortion rate at 12.3 per 1000 women is *below* world average of 15.24.
More like they're not having sex.
https://www.japantimes.co.jp/news/2016/09/16/national/social-issues/sexless-japan-almost-half-young-men-women-virgins-survey/
"A survey of Japanese people aged 18 to 34 found that almost 70 percent of unmarried men and 60 percent of unmarried women are not in a relationship."
"Moreover, many of them have never got close and cuddly. Around 42 percent of the men and 44.2 percent of the women admitted they were virgins."
"The government won’t be pleased that sexlessness is becoming as Japanese as sumo and sake. The administration of Prime Minister Shinzo Abe has talked up boosting the birthrate through support for child care, but until the nation bones up on bedroom gymnastics there’ll be no medals to hand out."
"Far from getting together and getting it on, the sexes are growing apart. There are now many more virgins than in 2010, when the last study was conducted and when only 36.2 percent of men and 38.7 percent of women said they had never had sex."