This kind of traveller likes to "pick up" partners for sex, in every destination they visit.
Along the way they are likely to pick up a terrifying range of STDs and transmit them to anyone stupid enough to fall for their pick up lines.
One hopes they are sensible enough to practice safe sex, but there is no guarantee such pick up operators will either carry of or use condoms.
Their goal is to have sex with at least one resident and, or a fellow traveller every night, for each destination they travel to.
I even came across one who invited me to join him for sex in multiple languages, the moment I arrived at my accomodation, when I pretended not to have either heard or understood his first invitation. I was sufficiently shocked to initially be rendered speechless. I had never met this man before in my life. It made me wary of the accomodation I was staying at. I had just arrived, quite dishevelled, with my backpack and wearing my sensible travel wear, so he sure could not have mistaken me as "lady of the night"!
Personally I prefer to witness predators of the four legged variety you see on safari, rather than such predatory human low-lifes.
Never be afraid to tell the predatory "pick up traveller" to go jump.
If you are one, seek counselling!
Anyone desperate enough to accept the advances of the travelling pick up operator does so at their own peril.