Can even a good person use someone out of desperation or last option?

Anonymous
Even though I feel bad when people use each other and the genders are currently destroying each other (men wasting a girl's years and woman baby trapping men), I would like to place myself in their position of desperation:

Since I'm a woman, place this example:
I'm 26 but if I was in my early to mid 30's, I see my time running out and it's either in-vitro fertilization or getting an awkward, desperate man with low social skills as a last resort. I would like to say I would still do the right thing and resist the temptation to do it but I would have to be on the position.

Or stealing food to feed your hungry child as last option... you already know stealing is wrong but you it's either do the right thing and let the child starve or steal to feed him/her. In that case, I don't know if I would be able to resist that temptation.
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And that person never imagine they would be on that awful position. That's a bad position to be in, you never wanted to use someone or steal anything, you feel terrible but it's your desperation, your last resort.
Can even a good person use someone out of desperation or last option?
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