Access Lovoo API using Python

An alternative approach would be the use of selenium for login and further using the session with requests.

E.g.

def login(user, pw):
    chrome_options = Options()
    chrome_options.add_experimental_option("detach", True)
    driver = webdriver.Chrome(options=chrome_options)
    driver.get("https://www.lovoo.com/login_check")
    user_agent = driver.execute_script("return navigator.userAgent;")
    iframe = driver.find_element(By.ID,"gdpr-consent-notice")
    driver.switch_to.frame(iframe)
    privacybutton = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.XPATH,"//b[contains(text(),'Accept All')]"))
    )
    privacybutton.click()
    driver.switch_to.default_content()
    loginbutton = WebDriverWait(driver, 4).until(
        EC.presence_of_element_located((By.XPATH, "//button[contains(text(),'Log in')]"))
    )
    loginbutton.click()
    loginbutton2=WebDriverWait(driver, 4).until(
        EC.presence_of_element_located((By.XPATH, "//button[contains(@data-automation-id,'login-submit-button')]"))
    )
    driver.find_element(By.XPATH, '//input[@name="authEmail"]').send_keys(user)
    driver.find_element(By.XPATH, '//input[@name="authPassword"]').send_keys(pw)
    webdriver.ActionChains(driver).move_to_element(loginbutton2).click(loginbutton2).perform()
    element = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "topmenu"))
    )
    return user_agent, driver.get_cookies()

(lat,lon)=(0.0,0.0)
with requests.Session() as session:
    user_agent, cookies = login(user, pw)
    session.cookies.update({c['name']: c['value'] for c in cookies})
    session.headers.update({'User-Agent': user_agent})
    session.get(f'https://www.lovoo.com/api_web.php/users?ageFrom=0&ageTo=2&latitude={lat}&longitude={lon}')