How do you know you have students doing this? Do they tell you? Do you ask them? Have you seen them?
Not trying to get off topic, but that comment astounds me that you would know this.
I've been teaching college classes in sex and gender for...over 35 years. I also teach human biology and the same questions about sexual and reproductive strategies are in the curriculum. I've also taught Intro to Human Sexuality.
The students do writing on how they meet sex partners and potential sex partners, decide to have sex and much else. This is standard in anthropology curriculum in several subfields.
I have done fieldwork within some of their communities (staying with them in their housing - although I haven't done that recently). Much has changed in these years. Online meet-ups are much, much more common and I'm seeing a steady increase in marriages resulting from online meetings.
Students can be very forthcoming in class. Other times, they have responded on our online classroom discussion forums (where they are relatively anonymous). They also can choose to write a paper on some topics (such as sex work or unusual arrangements). In the 90's, a few (maybe one a year? Out of 120-150 students) were strippers. Women actually engaged in prostitution never spoke about it publicly, but did approach me during office hours. A student who was a current sexworker (in the late 90's) introduced me to a few other women, who gave me interviews and other data. The women who were doing online and real world Femdom things made the most money. Since I'm on a college campus, I also overhear students talking about all kinds of things, which helps me frame questions for the classroom.
I have never actually watched anyone do streaming cam work, but I do have chat transcripts and screenshots that some students have added to their papers. I've also seen costumes and selfies of the women dressed in their working clothes (they look very different in their student roles). In the 200o's, there have been a few "sugar babies" and one example of a SB relationship that progressed to something more.
The naiveté of women students (especially as compared to men) about basic sex and health issues never ceases to amaze me.