The answer is not "tinder" and it's not about "sexual loneliness".
Pair bonding weakens as people age and accumulate more sexual partners. We actively encourage people to delay pair bonding - mainly by discouraging "high school sweethearts" from marrying, and instead promoting college and pursuing careers over building families. This leads to atomized, lonely individuals who realize later in life what they missed out on, but now with the odds of age stacked against them. Even if you do find your partner in college, you now have families in vastly different geographic areas with different histories and values, which weakens the support structure around that union. In the majority of cases this is not a positive thing for the couple.
Pornography is also a problem, as it misdirects individuals' sex drive away from finding suitable partners.
The pendulum needs to swing back towards more traditional values from when our societies were healthier and growing. Those values exist for a reason!