Two more points:
Casting my mind back, I believe the other example was of an older SB, in her late 30s, who was feeling her clock ticking, and wanted to have a child. I can't remember if marriage was to be part of the deal, or not.  

More importantly, here is a question I have wanted to put to other SDs for many years:
My understanding is that many SDs go bare, indeed insist on it. But what if the SB deliberately lies about being on birth control? That could be a ticket to 18 years of generous financial support? I am surprised I have never seen this discussed as an issue.

Run.  Don't walk from this.  Not only is this a financial trap.  It's a life trap.  Even if you have a lawyer write everything out that you have zero financial liability, imagine that coming back in 15 years with a kid wanting to know their dad?  Can't blame the kid.  

Now imagine you are in a LTR or marriage when that happens?  Have fun explaining it to your partner.

BEFORE COVID:  
I always had a detailed conversation with my new SB's about going bare. That included explaining why it's important to me, what I do to mitigate risks of STD's, and I asked for her recent tests and birth control status. If we got past all that, I made my best assessment of her desire to have kids, especially a kid with me.  I generally date SB's in their early 20's, and most of them (who don't already have a kid) have no desire to get preggers anytime soon. Those that already had a kid, or who were just dead broke with no viable earning skills are more problematic, of course.  

 
Next, I always offered to pay for her STD test(s) and BC. Most declined, as they are covered by health care, but not all.  Still, the risk remained, and I used to keep both home pregnancy tests and Plan-B at my place in ample supply. In over 12 years of Sugar dating, I have only paid for the "big expense" twice. The 1st time, I was probably not the father, and the 2nd time, I was definitely not. But we had an agreement that I would be adequately "compensated" after...  

 
DURING COVID:  
I had a smaller roster due to the risks.  My #1 was an aspiring mainstream actress and knew having a kid would be a career killer while she was trying to build her brand.  

 
Since I was necessarily less busy, I got a vasectomy once the health care system opened up for elective procedures. I mean, I had a LOT of free time on my hands...  

 
AFTER COVID:  
I still have the early conversation about going bare and testing.  But now I also hand over my sperm count test result along with my STD test results.  I still meet new POT's who remain reluctant, probably due to their own trust issues.  I don't move forward with them, or course. But I leave the door open for them if they change their mind.  

 
Observation:  
Only an empirical observation, but it seems it is easier in the last 4 years to find POT's who will agree, even older POT's between 25-35.  Why? Perhaps it's a combination of my improved skills on how I present the topic, and a general relaxation of society's stigma. But like I said... that's just my unscientific observation.  

 
PS:  When I travel to parts of Asia and meet providers, I am aware of the high number of pregnancy scams pulled on Western men. Now I have a "Get Out of Jail Free" card I can provide when needed to escape those traps.  

 
Life is good

 
The Cat