Why is my male cat constantly having erections?

Dear Most Esteemed and Knowledgeable Kitties: I really hope you can help. Basically, we’ve just got a male cat (2 years old) from a shelter and he is really affectionate and loves human contact. He constantly purrs when he’s with us. But the problem is, when he sits on my lap or lies on the bed with me, his genitals pop out. Then he jumps off and licks them. He really purrs loudly and kneads with his paws loads (he’s been declawed – not by us!). Is there any reason for this? It’s a bit disturbing really as it’s now making me afraid of showing him affection as he seems to get ‘aroused’ each time….

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