Different people get pleasure from all sorts of things. Pleasure is not the measure of good. A man can get pleasure out of smoking two packs of cigarettes a day but it is not good for him.

What if they consents to be used and they get pleasure from this thing?

Things are to be used. Never persons. People who use others for their own amusement or gain are rats (no intention to besmirch the good name of rodents, thought).

Subjective can mean "in a subject" (as in a person) or it can mean mere "opinion." Objective, on the other hand, means independent of one's opinion. In this sense, truth is an agreement between one's judgment (opinion) and reality.

But if you want to hold to your view, then your job is never again to complain about any injustice or harm someone does to anyone, because their opinion is just as valid as yours.

themselves to be controlled by their physical desires instead of treating themselves with dignity and self respect
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And this is wrong because...

is being indulgent,
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Why is wrong to be indulgent?

Objective moral order
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But there is no such thing as objective morality.Morality is just an opinion which exists only in the mind of a person ,so is by definition subjective.If God is a subject ,then his morality is subjective.So you can have objective order ,but to call this order moral is a subjective opinion ,not a fact.

intrude upon and to some degree harm/degrade marital love
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Maybe ,but the highest good is pleasure ,not love.

great harm to self
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No ,it brings pleasure and pleasure is good.