When I was in my 20s, just holding hands with a woman I was getting to know would get my erection going, the same with slow dancing. Dating in my 20 and 30s, I never had ED at any point because even just the thought I might be having sex was enough for my dick to start to swell. Even sleeping next to a woman was enough to get me hard most nights, even if we weren't having sex that evening. Waking up next to a woman also ensured that I got hard, and I always made sure that they were fully aware of it when we cuddled. More often than not, it led to morning sex, which is almost always great as you are well rested.
French kissing has almost always gotten me hard from my 20 to my 60s.
In my late 40s I started noticing that it took longer for me to get hard sometimes, and on occasion, I really didn't get that hard at all despite extensive foreplay. Or I would get hard but then easily lose the erection if I was distracted even for a few seconds. The first time I lost an erection while fucking was devastating as I was really into the love making and sex, but my penis wasn't cooperating. But this didn't happen all the time. I still had raging hard erections most of the time, night-time erection, and occasional morning wood, but random times when Willy wasn't his old self.
That's when I talked to my doctor. I had no true underlying cause other than age and being slightly overweight, so I was prescribed Cialis and it worked wonders. AT full strength (20mg) my erections were as hard as I was at 19 years old and in the best shape of my life. Not so hard that it hurt, but noticeably harder than even my perfectly hard and stiff 'normal' erections.
I now use the 5mg dose of Tadalafil (generic Cialis) when I feel like I've had a stressful day or week, and I know sex may be on the agenda. I still get raging hard without any chemical help, but I never know when things will work and when they will not. That 5mg pill is an insurance policy that if things get sexual, I am virtually guaranteed to get a raging hard-on every time