Indagar means 'to investigate' or 'to inquire'. It's a more formal and less common verb than 'preguntar' (to ask), making it stand out.
In the song, the singer says, "no estoy dispuesto a hacer mi payasada para ti es no indagar a que pueda sufrir" (I'm not willing to make a fool of myself for you, it's not to inquire into your suffering). He uses indagar to express a deeper level of probing or understanding someone's pain, rather than just asking a simple question. This word adds a layer of intellectual curiosity and concern to the lyrics.
Elvis Martinez's "El Placer Del Sexo" is a really direct and kind of cheeky song that asks a woman if she's truly happy with her sex life. He starts by apologizing if his question scares her, acknowledging her religion might have limits on sex. But he sees her looking sad, like something's missing to make her happy.
He's not afraid to be blunt, asking her, "¿Usted cree que yo estoy bien disfrutar de los placeres del sexo Haciéndolo con su marido cuántas veces Le ha tendido en su lecho?" [Do you think I'm okay enjoying the pleasures of sex Doing it with your husband how many times Has he laid you in his bed?]. He suggests her husband might be neglecting her, leaving her feeling abandoned. He even criticizes men who are too macho and forget their wives' needs. He then offers a solution, inviting her to listen to his song and discover new things, promising she'll feel like she's flying and living again if she gives in to her desires.